CN102866935A - Instant replication method and storage system based on ISCSI (internet small computer system interface) - Google Patents
Instant replication method and storage system based on ISCSI (internet small computer system interface) Download PDFInfo
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Abstract
The invention discloses an instant replication method and a storage system based on an ISCSI (internet small computer system interface). The instant replication method includes the steps: generating a data block and a writing request by a client; transmitting the writing request to an IPSAN (internet protocol storage area network) control server by the client; generating a data forwarding command and storage management information by the IPSAN control server; transmitting the storage management information and the data forwarding command to the client by the IPSAN control server; backing up an IP (internet protocol) address of an ISCSI hard disk and the data forwarding command to a target ISCSI hard disk; writing in the data block by the target ISCSI hard disk; transmitting the data block to a backup ISCSI hard disk through a rear-end Ethernet switch according to the data forwarding command and an IP address of the backup ISCSI hard disk by the target ISCSI hard disk; and backing up the data block by the backup ISCSI hard disk. With the instruction of the IPSAN control server, data are directionally and instantly replicated, and replication delay and resource occupancy of data stored and forwarded by the IPSAN control server are avoided.
Description
Technical field
The present invention relates to realize the method that local instant mirror copies take iscsi disk as the enterprise storage system on basis, relate in particular to a kind of instant clone method and storage system based on ISCSI.
Background technology
ISCSI is that purpose is in order with the IP agreement memory device to be linked together by the network storage standard of IETF (Internet Engineering Task Force, Internet Engineering task groups) exploitation.By transmitting scsi command and data at IP network, iSCSI has promoted the transmission of data between internet, has also promoted the remote management of data simultaneously.Because its outstanding data transmission capabilities, iSCSI agreement are considered to promote one of key factor of storage area network (Storage Area Network is called for short SAN) market fast development.Because the widespread use of IP network, iSCSI can be at LAN (Local Area Network, LAN (Local Area Network)), WAN (Wide Area Network, wide area network) even the enterprising line number of internet reportedly send, so that data storage no longer is subjected to the restriction of region.
The iSCSI agreement is different according to the role, is divided into originating end and destination end.For the consideration of performance, some manufacturer has adopted special-purpose integrated circuit board to process TCP/IP and the iSCSI agreement of originating end, i.e. the HBA of iSCSI (Host Bus Adapter, host bus adaptor) card.But at destination end (Target), each storage manufacturer adopts PC (Personal Computer substantially, personal computer) storage architecture of composition iSCSI, be that memory device is based upon on the basis of PC server, namely select one common, function admirable, can support the PC (being generally PC server and industry control server) of polylith hard disk, select a relatively mature and stable iSCSI Target (iscsi target end) software, iSCSI Target software is installed on the PC server, make common PC server be transformed into an iSCSI memory device that connects a plurality of hard disks, and externally provide the iSCSI Data Transport Protocol by the Ethernet card of PC server.On the iSCSI of PC framework memory device, all RAID (Redundant Array of Independent Disk, raid-array) group verification, logical volume management, iSCSI computing, TCP/IP computing etc. all are to realize (also some equipment adopts higher TOE (TCP Offload Engine, the transmission control protocol offload engine) network interface card of price to realize the TCP/IP computing certainly) in the pure software mode.Therefore the performance requirement to the CPU of PC and internal memory is higher.The in addition as easy as rolling off a log impact that is subjected to the PC operation condition of server of the performance of iSCSI memory device.
The data reading of enterprise storage system is to adopt the mode of data block to carry out with writing.For guaranteeing the security of data, usually to carry out dual or more multiple copy backup to the data block that writes disk array, in case data are lost because of hard disk corruptions (high-probability event).Present enterprise-level storage products is when carrying out data Replica, the basic internal system IPSAN Control Server that adopts is finished twice of data block manifolding or method repeatedly, perhaps snapshot is carried out in the operation of system, at the specific snapshot that constantly utilizes the data of change are copied subsequently; Can guarantee like this safety and the integrality of data.Therefore, the IPSAN Control Server needs repeatedly to finish storage, transmits and cause replica delay and resource occupation between different iscsi disks; Increased the weight of the burden of IPSAN Control Server, higher to the equipment requirement of IPSAN Control Server.
Summary of the invention
The object of the present invention is to provide a kind of instant clone method based on ISCSI and based on the storage system of ISCSI, its orientation that realizes data under the instruction of IPSAN Control Server copies immediately, has avoided data communication device to cross the IPSAN Control Server and has stored and transmit replica delay and the resource occupation that causes.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of instant clone method based on ISCSI is characterized in that: may further comprise the steps:
Step S101: client generated data piece and write request;
Step S102: client is sent to the IPSAN Control Server by the front end Ethernet switch with write request;
Step S103:IPSAN Control Server is according to write request and management information table, generated data forward command and management information, management information comprise that the IPSAN Control Server is the IP address and the IP address of backing up the ISCSI hard disk of the target ISCSI hard disk of data block distribution;
Wherein, the IPSAN Control Server comprises the management information table, and described management information table comprises the state table of all ISCSI hard disks, address mapping table, Mirroring Mapping table, each ISCSI hard disk load meter; Target ISCSI hard disk is the ISCSI hard disk as memory disc, and backup ISCSI hard disk is the ISCSI hard disk as back-up disk;
Step S104:IPSAN Control Server is sent to client with management information and data retransmission order by the front end Ethernet switch;
Step S105: client is according to the IP address of target hard disk, and with data block, IP address and the data retransmission order of backup ISCSI hard disk are sent to target ISCSI hard disk by the rear end Ethernet switch;
Step S106: target ISCSI hard disk writes data block;
Step S107: target ISCSI hard disk is sent to backup ISCSI hard disk with data block by the rear end Ethernet switch according to the IP address of data retransmission order and backup ISCSI hard disk;
Step S108: backup ISCSI hard disk backs up data block.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of storage system based on ISCSI is characterized in that:
Comprise storage unit;
Each storage unit comprises client, front end Ethernet switch, IPSAN Control Server, rear end Ethernet switch and a plurality of ISCSI hard disk;
Described client is connected with the front end Ethernet switch by Ethernet with the IPSAN Control Server of this storage unit, and described IPSAN Control Server is connected with all rear end Ethernet switches of described storage system respectively;
The rear end Ethernet switch of described client and this storage unit is by being connected; The ISCSI hard disk of described storage unit is connected with all rear end Ethernet switches of storage system respectively;
Described IPSAN Control Server, realize and client by front end Ethernet switch and rear end Ethernet switch, non-data communication between the ISCSI hard disk is used for all ISCSI hard disks are managed, and realizes the data transmission between client and the specific ISCSI hard disk.
Instant clone method and storage system based on ISCSI of the present invention, the ISCSI hard disk that adopts has the data retransmission logic function, this is so that can carry out the clog-free communication of port to port by Ethernet switch between the ISCSI hard disk, the orientation that realizes data under the instruction of IPSAN Control Server copies immediately, has avoided data communication device to cross the IPSAN Control Server and has stored and transmit replica delay and the resource occupation that causes.
Description of drawings
Fig. 1 is the schematic flow sheet that data block is write and data block is sent to backup ISCSI hard disk based on target ISCSI hard disk in the instant clone method of ISCSI of the present invention;
Fig. 2 is the structural representation of the storage system based on ISCSI of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, instant clone method and the storage system based on ISCSI of the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Embodiment one
A kind of instant clone method based on ISCSI of the present invention may further comprise the steps:
Step S101: client generated data piece and write request;
Step S102: client is sent to the IPSAN Control Server by the front end Ethernet switch with write request;
Step S103:IPSAN Control Server is according to write request and management information table, generated data forward command and management information, management information comprise that the IPSAN Control Server is the IP address and the IP address of backing up the ISCSI hard disk of the target ISCSI hard disk of data block distribution;
Wherein, the IPSAN Control Server comprises the management information table, and described management information table comprises the state table of all ISCSI hard disks, address mapping table, Mirroring Mapping table, each ISCSI hard disk load meter; Target ISCSI hard disk is the ISCSI hard disk as memory disc, and backup ISCSI hard disk is the ISCSI hard disk as back-up disk;
Step S104:IPSAN Control Server is sent to client with management information and data retransmission order by the front end Ethernet switch;
Step S105: client is according to the IP address of target hard disk, and with data block, IP address and the data retransmission order of backup ISCSI hard disk are sent to target ISCSI hard disk by the rear end Ethernet switch;
Step S106: target ISCSI hard disk writes data block;
Step S107: target ISCSI hard disk is sent to backup ISCSI hard disk with data block by the rear end Ethernet switch according to the IP address of data retransmission order and backup ISCSI hard disk;
Step S108: backup ISCSI hard disk backs up data block.
Preferably, step S105 may further comprise the steps:
Step S105-1: client is according to the IP address of target hard disk, and with data block, IP address and the data retransmission order of backup ISCSI hard disk send to target ISCSI hard disk by the rear end Ethernet switch; Target ISCSI hard disk is informed the client situation;
Step S105-2: client is according to reception condition, judge data block, (in other words whether IP address and the data retransmission order of backup ISCSI hard disk successfully send to target ISCSI hard disk, target ISCSI hard disk is successfully being received data block, in the time of the IP address of backup ISCSI hard disk and data retransmission order, inform that client successfully receives, at this moment, the data block of receiving, IP address and the data retransmission order of backup ISCSI hard disk are present in the buffer memory of target ISCSI hard disk, do not have actual writing on the physical hard disk);
Send to successfully, then continue step S106;
Send to unsuccessfully, client is informed the IPSAN Control Server, and the IPSAN Control Server distributes new target ISCSI hard disk, the in-problem ISCSI hard disk of mark; And operating procedure S104 (in the circulation of S108, sending to target ISCSI hard disk unsuccessful is small probability event at this S104, so this circulation is not an endless loop; If unfortunate frequent occurrence, then whole storage system is under the impact of certain force majeure amount (occuring such as disaster), does not consider this situation in this application.So, S104 is not endless loop to the circulation of S108, that is to say that necessarily having a target ISCSI hard disk successfully receives data block, management information and data retransmission order, certainly, the data block of receiving, management information and data retransmission order are arranged in the buffer memory of target ISCSI hard disk, do not have actual writing on the physical hard disk).
Preferably, step S106 may further comprise the steps: as shown in Figure 1,
Step S106-1: the control chip of target ISCSI hard disk writes local hard drive with data block;
Step S106-2: whether the control chip judgement of target ISCSI hard disk writes local hard drive successful;
Write successfully, then the control chip of operating procedure S106-21:ISCSI target hard disk generates successfully report and is sent to the IPSAN Control Server by the rear end Ethernet switch;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting;
Do not reach N time, then operating procedure S106-1;
Reach N time, operating procedure S106-22 then: the control chip of target ISCSI hard disk generates the report of target ISCSI hard disk failure and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new target ISCSI hard disk; The control chip of fault target ISCSI hard disk is with data block, IP address and the data retransmission order of backup ISCSI hard disk are sent to new target ISCSI hard disk, the control chip of fault target ISCSI hard disk discharges the local cache space, and new target ISCSI hard disk re-executes S106.Equally, the fault here is small probability event, and S106 is not an endless loop.
Preferably, step S107 may further comprise the steps: as shown in Figure 1,
Step S107-1: the control chip of target ISCSI hard disk is sent to data block the control chip of backup ISCSI hard disk;
Step S107-2: the control chip of target ISCSI hard disk judges whether the control chip receive data piece of backup ISCSI hard disk is successful;
Receive successfully, then operating procedure S107-21: the control chip of backup ISCSI hard disk generates status report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After target ISCSI hard disk processing, be sent to the IPSAN Control Server by the rear end Ethernet switch, and generate when successfully reporting and being sent to the IPSAN Control Server at the control chip of ISCSI target hard disk, discharge the local cache space of the control chip of ISCSI target hard disk;
Receive unsuccessfully, judge then whether the number of times that takes defeat reaches M time; Wherein, M is a natural number of setting; Do not reach M time, then operating procedure S107-1;
Reach M time, operating procedure S107-22 then: the control chip of target ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new backup ISCSI hard disk, and the IP address of new backup ISCSI hard disk informed target ISCSI hard disk, target ISCSI hard disk re-executes S107.Equally, the fault here is small probability event, and S107 is not an endless loop.
Preferably, step S108 may further comprise the steps:
Step S108-1: the control chip of backup ISCSI hard disk writes local hard drive with data block;
Step S108-2: whether the control chip judgement of backup ISCSI hard disk writes local hard drive successful;
Write successfully, then operating procedure S108-21: the control chip of backup ISCSI hard disk generates successfully report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting;
Do not reach N time, then operating procedure S108-1;
Reach N time, then operating procedure S108-22: the control chip of backup ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk; Described IPSAN Control Server distributes the IP address of backup ISCSI hard disk again for data block.
Embodiment two
A kind of storage system based on ISCSI of the present invention as shown in Figure 2, is characterized in that:
Comprise storage unit;
Each storage unit comprises client, front end Ethernet switch (among the figure for illustrating), IPSAN Control Server, rear end Ethernet switch and a plurality of ISCSI hard disk;
The IPSAN Control Server of described client and this storage unit is connected with the front end Ethernet switch among the figure for illustrating by Ethernet) be connected, described IPSAN Control Server is connected with all rear end Ethernet switches of described storage system respectively;
The rear end Ethernet switch of described client and this storage unit is by being connected; The ISCSI hard disk of described storage unit is connected with all rear end Ethernet switches of storage system respectively;
Described IPSAN Control Server, realize and client by front end Ethernet switch and rear end Ethernet switch, non-data communication between the ISCSI hard disk is used for all ISCSI hard disks are managed, and realizes the data transmission between client and the specific ISCSI hard disk.
Client is with data, data retransmission order and management information are successfully write and are just no longer participated in the subsequent operation that immediately copies behind the buffer memory of a target ISCSI hard disk, subsequent operation is interacted by IPSAN Control Server and a plurality of ISCSI hard disk and finishes, and guarantees that data write successfully.Here taking into account system is not by the effect of force majeure amount, and fault all is small probability event.
Preferably, described client is used for generated data piece and write request, and by the front end Ethernet switch write request is sent to the IPSAN Control Server;
Described IPSAN Control Server, be used for according to write request and management information table, generated data forward command and management information, described management information comprise that the IPSAN Control Server is the IP address and the IP address of backing up the ISCSI hard disk of the target ISCSI hard disk of data block distribution; The IPSAN Control Server also is used for management information and data retransmission order are sent to client by the front end Ethernet switch;
Wherein, described IPSAN Control Server comprises the management information table, and described management information table comprises the state table of all ISCSI hard disks of storage system, address mapping table, Mirroring Mapping table, each ISCSI hard disk load meter; Target ISCSI hard disk is the ISCSI hard disk as memory disc, and backup ISCSI hard disk is the ISCSI hard disk as back-up disk;
Described client is with data block, and management information and data retransmission order are sent to the rear end Ethernet switch;
Described rear end Ethernet switch is according to the IP address of ISCSI target hard disk, and with this data block, the IP address of data retransmission order and backup ISCSI hard disk is sent to the ISCSI target hard disk;
Described ISCSI target hard disk writes data block and according to data retransmission order and the IP address of backing up the ISCSI hard disk this data block is sent to backup ISCSI hard disk by the rear end Ethernet switch;
Described backup ISCSI hard disk backs up data block.
Preferably, described ISCSI hard disk comprises control chip and hard disk; In Fig. 2, control chip represents that with iSCSI T end card hard disk embodiment illustrated in fig. 2 adopts the SATA hard disk.
Described ISCSI hard disk is during as the ISCSI target hard disk, and the control chip of target ISCSI hard disk writes local hard drive with data block; According to the IP address of data retransmission order and backup ISCSI hard disk, data block is sent to backup ISCSI hard disk by the rear end Ethernet switch simultaneously;
Described ISCSI hard disk is during as backup ISCSI hard disk, and the control chip of backup ISCSI hard disk writes local hard drive with data block.
Preferably, the control chip of described target ISCSI hard disk writes data block in the local hard drive process, and the control chip of ISCSI target hard disk moves according to the substep of step S106 and S106:
Step S106 may further comprise the steps:
Step S106-1: the control chip of target ISCSI hard disk writes local hard drive with data block;
Step S106-2: whether the control chip judgement of target ISCSI hard disk writes local hard drive successful;
Write successfully, then the control chip of operating procedure S106-21:ISCSI target hard disk generates and successfully reports and logical
Later hold Ethernet switch to be sent to the IPSAN Control Server;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting;
Do not reach N time, then operating procedure S106-1;
Reach N time, operating procedure S106-22 then: the control chip of target ISCSI hard disk generates the report of target ISCSI hard disk failure and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new target ISCSI hard disk; The control chip of fault target ISCSI hard disk is with data block, IP address and the data retransmission order of backup ISCSI hard disk are sent to new target ISCSI hard disk, the control chip of fault target ISCSI hard disk discharges the local cache space, and new target ISCSI hard disk re-executes S106.
Preferably, the control chip of target ISCSI hard disk is sent to data block in the process of backup ISCSI hard disk by the rear end Ethernet switch, and the control chip of target ISCSI hard disk moves according to the substep of step S107 and S107:
Step S107 may further comprise the steps:
Step S107-1: the control chip of target ISCSI hard disk is sent to data block the control chip of backup ISCSI hard disk;
Step S107-2: the control chip of target ISCSI hard disk judges whether the control chip receive data piece of backup ISCSI hard disk is successful;
Receive successfully, then operating procedure S107-21: the control chip of backup ISCSI hard disk generates status report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After target ISCSI hard disk processing, be sent to the IPSAN Control Server by the rear end Ethernet switch, and generate when successfully reporting and being sent to the IPSAN Control Server at the control chip of ISCSI target hard disk, discharge the local cache space of the control chip of ISCSI target hard disk;
Receive unsuccessfully, judge then whether the number of times that takes defeat reaches M time; Wherein, M is a natural number of setting;
Do not reach M time, then operating procedure S107-1;
Reach M time, operating procedure S107-22 then: the control chip of target ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new backup ISCSI hard disk, and the IP address of new backup ISCSI hard disk informed target ISCSI hard disk, target ISCSI hard disk re-executes S107.
Preferably, the control chip of backup ISCSI hard disk writes data block in the process of local hard drive, and the control chip of backup ISCSI hard disk moves according to the substep of step S108 and S108:
Step S108 may further comprise the steps:
Step S108-1: the control chip of backup ISCSI hard disk writes local hard drive with data block;
Step S108-2: whether the control chip judgement of backup ISCSI hard disk writes local hard drive successful;
Write successfully, then operating procedure S108-21: the control chip of backup ISCSI hard disk generates successfully report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting;
Do not reach N time, then operating procedure S108-1;
Reach N time, then operating procedure S108-22: the control chip of backup ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk; Described IPSAN Control Server distributes the IP address of backup ISCSI hard disk again for data block.
Instant clone method and storage system based on ISCSI of the present invention, the ISCSI hard disk that adopts has the data retransmission logic function, this is so that can carry out the clog-free communication of port to port by Ethernet switch between the ISCSI hard disk, the orientation that realizes data under the instruction of IPSAN Control Server copies immediately, has avoided data communication device to cross the IPSAN Control Server and has stored and transmit replica delay and the resource occupation that causes.
Should be noted that at last that obviously those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these revise and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification.
Claims (11)
1. instant clone method based on ISCSI is characterized in that: may further comprise the steps:
Step S101: client generated data piece and write request;
Step S102: client is sent to the IPSAN Control Server by the front end Ethernet switch with write request;
Step S103:IPSAN Control Server is according to write request and management information table, generated data forward command and management information, management information comprise that the IPSAN Control Server is the IP address and the IP address of backing up the ISCSI hard disk of the target ISCSI hard disk of data block distribution;
Wherein, the IPSAN Control Server comprises the management information table, and described management information table comprises the state table of all ISCSI hard disks, address mapping table, Mirroring Mapping table, each ISCSI hard disk load meter; Target ISCSI hard disk is the ISCSI hard disk as memory disc, and backup ISCSI hard disk is the ISCSI hard disk as back-up disk;
Step S104:IPSAN Control Server is sent to client with management information and data retransmission order by the front end Ethernet switch;
Step S105: client is according to the IP address of target hard disk, and with data block, IP address and the data retransmission order of backup ISCSI hard disk are sent to target ISCSI hard disk by the rear end Ethernet switch;
Step S106: target ISCSI hard disk writes data block;
Step S107: target ISCSI hard disk is sent to backup ISCSI hard disk with data block by the rear end Ethernet switch according to the IP address of data retransmission order and backup ISCSI hard disk;
Step S108: backup ISCSI hard disk backs up data block.
2. the instant clone method based on ISCSI according to claim 1 is characterized in that:
Step S105 may further comprise the steps:
Step S105-1: client is according to the IP address of target hard disk, and with data block, IP address and the data retransmission order of backup ISCSI hard disk send to target ISCSI hard disk by the rear end Ethernet switch; Target ISCSI hard disk is informed the client situation;
Step S105-2: client is judged data block according to reception condition, and whether IP address and the data retransmission order of backup ISCSI hard disk successfully send to target ISCSI hard disk;
Send to successfully, then continue step S106;
Send to unsuccessfully, client is informed the IPSAN Control Server, and the IPSAN Control Server distributes new target ISCSI hard disk, the in-problem ISCSI hard disk of mark; And operating procedure S104.
3. the instant clone method based on ISCSI according to claim 1 is characterized in that:
Step S106 may further comprise the steps:
Step S106-1: the control chip of target ISCSI hard disk writes local hard drive with data block;
Step S106-2: whether the control chip judgement of target ISCSI hard disk writes local hard drive successful;
Write successfully, then the control chip of operating procedure S106-21:ISCSI target hard disk generates successfully report and is sent to the IPSAN Control Server by the rear end Ethernet switch;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting;
Do not reach N time, then operating procedure S106-1;
Reach N time, operating procedure S106-22 then: the control chip of target ISCSI hard disk generates the report of target ISCSI hard disk failure and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new target ISCSI hard disk; The control chip of fault target ISCSI hard disk is with data block, IP address and the data retransmission order of backup ISCSI hard disk are sent to new target ISCSI hard disk, the control chip of fault target ISCSI hard disk discharges the local cache space, and new target ISCSI hard disk re-executes S106.
4. the instant clone method based on ISCSI according to claim 3 is characterized in that:
Step S107 may further comprise the steps:
Step S107-1: the control chip of target ISCSI hard disk is sent to data block the control chip of backup ISCSI hard disk;
Step S107-2: the control chip of target ISCSI hard disk judges whether the control chip receive data piece of backup ISCSI hard disk is successful;
Receive successfully, then operating procedure S107-21: the control chip of backup ISCSI hard disk generates status report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After target ISCSI hard disk processing, be sent to the IPSAN Control Server by the rear end Ethernet switch, and generate when successfully reporting and being sent to the IPSAN Control Server at the control chip of ISCSI target hard disk, discharge the local cache space of the control chip of ISCSI target hard disk;
Receive unsuccessfully, judge then whether the number of times that takes defeat reaches M time; Wherein, M is a natural number of setting;
Do not reach M time, then operating procedure S107-1;
Reach M time, operating procedure S107-22 then: the control chip of target ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new backup ISCSI hard disk, and the IP address of new backup ISCSI hard disk informed target ISCSI hard disk, target ISCSI hard disk re-executes S107.
5. the instant clone method based on ISCSI according to claim 1 is characterized in that:
Step S108 may further comprise the steps:
Step S108-1: the control chip of backup ISCSI hard disk writes local hard drive with data block;
Step S108-2: whether the control chip judgement of backup ISCSI hard disk writes local hard drive successful;
Write successfully, then operating procedure S108-21: the control chip of backup ISCSI hard disk generates successfully report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting; Do not reach N time, then operating procedure S108-1;
Reach N time, then operating procedure S108-22: the control chip of backup ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk; Described IPSAN Control Server distributes the IP address of backup ISCSI hard disk again for data block.
6. storage system based on ISCSI is characterized in that:
Comprise storage unit;
Each storage unit comprises client, front end Ethernet switch, IPSAN Control Server, rear end Ethernet switch and a plurality of ISCSI hard disk;
Described client is connected with the front end Ethernet switch by Ethernet with the IPSAN Control Server of this storage unit, and described IPSAN Control Server is connected with all rear end Ethernet switches of described storage system respectively;
The rear end Ethernet switch of described client and this storage unit is by being connected; The ISCSI hard disk of described storage unit is connected with all rear end Ethernet switches of storage system respectively;
Described IPSAN Control Server, realize and client by front end Ethernet switch and rear end Ethernet switch, non-data communication between the ISCSI hard disk is used for all ISCSI hard disks are managed, and realizes the data transmission between client and the specific ISCSI hard disk.
7. the storage system based on ISCSI according to claim 6 is characterized in that:
Described client is used for generated data piece and write request, and by the front end Ethernet switch write request is sent to the IPSAN Control Server;
Described IPSAN Control Server, be used for according to write request and management information table, generated data forward command and management information, described management information comprise that the IPSAN Control Server is the IP address and the IP address of backing up the ISCSI hard disk of the target ISCSI hard disk of data block distribution; The IPSAN Control Server also is used for management information and data retransmission order are sent to client by the front end Ethernet switch;
Wherein, described IPSAN Control Server comprises the management information table, and described management information table comprises the state table of all ISCSI hard disks of storage system, address mapping table, Mirroring Mapping table, each ISCSI hard disk load meter; Target ISCSI hard disk is the ISCSI hard disk as memory disc, and backup ISCSI hard disk is the ISCSI hard disk as back-up disk;
Described client is with data block, and management information and data retransmission order are sent to the rear end Ethernet switch;
Described rear end Ethernet switch is according to the IP address of ISCSI target hard disk, and with this data block, the IP address of data retransmission order and backup ISCSI hard disk is sent to the ISCSI target hard disk;
Described ISCSI target hard disk writes data block and according to data retransmission order and the IP address of backing up the ISCSI hard disk this data block is sent to backup ISCSI hard disk by the rear end Ethernet switch;
Described backup ISCSI hard disk backs up data block.
8. the storage system based on ISCSI according to claim 7 is characterized in that:
Described ISCSI hard disk comprises control chip and hard disk;
Described ISCSI hard disk is during as the ISCSI target hard disk, and the control chip of target ISCSI hard disk writes local hard drive with data block; According to the IP address of data retransmission order and backup ISCSI hard disk, data block is sent to backup ISCSI hard disk by the rear end Ethernet switch simultaneously;
Described ISCSI hard disk is during as backup ISCSI hard disk, and the control chip of backup ISCSI hard disk writes local hard drive with data block.
9. the storage system based on ISCSI according to claim 8 is characterized in that:
The control chip of described target ISCSI hard disk writes data block in the local hard drive process, and the control chip of ISCSI target hard disk moves according to the substep of step S106 and S106:
Step S106 may further comprise the steps:
Step S106-1: the control chip of target ISCSI hard disk writes local hard drive with data block;
Step S106-2: whether the control chip judgement of target ISCSI hard disk writes local hard drive successful;
Write successfully, then the control chip of operating procedure S106-21:ISCSI target hard disk generates successfully report and is sent to the IPSAN Control Server by the rear end Ethernet switch;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting;
Do not reach N time, then operating procedure S106-1;
Reach N time, operating procedure S106-22 then: the control chip of target ISCSI hard disk generates the report of target ISCSI hard disk failure and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new target ISCSI hard disk; The control chip of fault target ISCSI hard disk is with data block, IP address and the data retransmission order of backup ISCSI hard disk are sent to new target ISCSI hard disk, the control chip of fault target ISCSI hard disk discharges the local cache space, and new target ISCSI hard disk re-executes S106.
10. the storage system based on ISCSI according to claim 9 is characterized in that:
The control chip of target ISCSI hard disk is sent to data block in the process of backup ISCSI hard disk by the rear end Ethernet switch, the control chip of target ISCSI hard disk moves according to the substep of step S107 and S107:
Step S107 may further comprise the steps:
Step S107-1: the control chip of target ISCSI hard disk is sent to data block the control chip of backup ISCSI hard disk;
Step S107-2: the control chip of target ISCSI hard disk judges whether the control chip receive data piece of backup ISCSI hard disk is successful;
Receive successfully, then operating procedure S107-21: the control chip of backup ISCSI hard disk generates status report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After target ISCSI hard disk processing, be sent to the IPSAN Control Server by the rear end Ethernet switch, and generate when successfully reporting and being sent to the IPSAN Control Server at the control chip of ISCSI target hard disk, discharge the local cache space of the control chip of ISCSI target hard disk;
Receive unsuccessfully, judge then whether the number of times that takes defeat reaches M time; Wherein, M is a natural number of setting;
Do not reach M time, then operating procedure S107-1;
Reach M time, operating procedure S107-22 then: the control chip of target ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to the IPSAN Control Server by the rear end Ethernet switch, IPSAN Control Server mark fault ISCSI hard disk, and distribute a new ISCSI hard disk as new backup ISCSI hard disk, and the IP address of new backup ISCSI hard disk informed target ISCSI hard disk, target ISCSI hard disk re-executes S107.
11. the storage system based on ISCSI according to claim 10 is characterized in that:
The control chip of backup ISCSI hard disk writes data block in the process of local hard drive, and the control chip of backup ISCSI hard disk moves according to the substep of step S108 and S108:
Step S108 may further comprise the steps:
Step S108-1: the control chip of backup ISCSI hard disk writes local hard drive with data block;
Step S108-2: whether the control chip judgement of backup ISCSI hard disk writes local hard drive successful;
Write successfully, then operating procedure S108-21: the control chip of backup ISCSI hard disk generates successfully report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk;
Write unsuccessfully, judge then whether write the frequency of failure reaches N time; Wherein, N is a natural number of setting;
Do not reach N time, then operating procedure S108-1;
Reach N time, then operating procedure S108-22: the control chip of backup ISCSI hard disk generates backup ISCSI hard disk failure report and is sent to target ISCSI hard disk by the rear end Ethernet switch; After the ISCSI target hard disk is processed, be sent to the IPSAN Control Server by the rear end Ethernet switch, discharge the local cache space of the control chip of backup ISCSI hard disk; Described IPSAN Control Server distributes the IP address of backup ISCSI hard disk again for data block.
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