CN101645030A - Method for measuring signal integrality based on SAS storage system - Google Patents
Method for measuring signal integrality based on SAS storage system Download PDFInfo
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- CN101645030A CN101645030A CN200910018506A CN200910018506A CN101645030A CN 101645030 A CN101645030 A CN 101645030A CN 200910018506 A CN200910018506 A CN 200910018506A CN 200910018506 A CN200910018506 A CN 200910018506A CN 101645030 A CN101645030 A CN 101645030A
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Abstract
The invention provides a method for measuring signal integrity based on an SAS storage system, comprising the following steps: firstly, connecting a server mainboard with an SAS measuring jig with a USB interface so that the server mainboard is connected with a measuring instrument through the SAS measuring jig; measuring an SAS signal source of the server mainboard; using a Tektronix DSA70804 oscillograph with the band width of 8 GHz as the measuring instrument; using a Tektronix TCA-SMA connector adding an SMA standard cable with the band width of 17.5 GHz as a sounding rod; measuring the signal rate, the signal UI, the signal shaking, the positive signal level, the negative signal level, an eye pattern, the DP/DN differential signal rise time and the DP/DN differential signal internal time inclination of an SAS differential signal DP/DN; ensuring that SAS signals all meet the specifications of the Industrial Association through measurement so as to ensure the signal integrity of a whole storage subsystem.
Description
Technical field
The present invention relates to computer communication field, be specifically related to problem based on the method for SAS storage system measuring signal integrality.
Background technology
Before more than 20 year, Parallel SCSI and Parallel ATA standard are asked the city in succession, the principal feature of the role who is playing the part of oneself in application separately: SCSI is to provide instruction set, support multitask, low, the high bandwidth and stable, reliable of CPU occupation rate for oneself, is mainly used in enterprise-class tools; The principal feature of ATA be simple, cost is low, is mainly used in desktop level user.System and application demand along with continuous upgrading, the variety of issue that parallel (Parallel) technology can't be avoided, limit as signal terminating, the reflection of cable and connector, signal cross-talk, and problem such as device addressing ability all becomes the obstacle that improves data transmission performance, in usefulness with expand on the potentiality and also be restricted.Therefore, from PATA to ATA133, to Ultra320, product has not had the space of lifting from Parallel SCSI.
Serial Attached SCSI (SAS) is a kind of novel storage interface standard, because its point-to-point link, stable reliability, abundant and ripe instruction set, significant extendibility (utilize extension facility, extend to 16384 equipment at most) etc. advantage, will develop into the memory interface of main flow gradually.In the server system of enterprise-level, the SAS storage system because its signal at a high speed transmits, must relate to the problems of Signal Integrity of SAS signal as its crucial part,
Current server system has been broken through traditional system concept, develops towards integrated, intelligent, standardized direction.For total system, server, cable and Terminal Design are respectively different company's exploitations, in this case, compatible problem can't be avoided, do not match and problem such as signal cross-talk such as impedance, make the instability of whole SAS storage system, thereby cause the phenomenon of client's loss of vital data to take place.
In the face of these problems, for server S AS storage system, we can come the transmission quality of seizing signal according to the SAS-2 industrial specification of standard, make each parameter of signal can both meet the code requirement of SAS-2, allow server, cable, terminal device all move under unified standard, thereby the SAS signal quality of total system is well transmitted, and then the impedance of avoiding because signal quality is bad producing does not match and problem such as signal cross-talk.
Summary of the invention
The present invention utilizes the SAS-2 industrial specification of T10 to be the theory support point, is the problem that concrete check form solves SAS storage system signal integrity with signal testing, and concrete summary of the invention can be divided into following three aspects:
1. according to the standard of the SAS-2 signal of T10 TIA, go to define the signal source of whole storage subsystem
2. hold the electrical equipment standard of the SAS signal of mainboard controller, be specially the opering characteristic of electric apparatus standard of SAS controller end Tx signal, the signal description feature such as transfer rate, signal jitter, signal level, signal eye diagram that comprises signal, the SAS output signal characteristics of clear and definite our server host board.
3. according to the impedance requirement of SAS-2, the impedance that we define transmission cable meets the impedance requirement that SAS transmits, and mainly is the requirement of the certain compliant of characteristic impedance of constraint Tx and Rx, with this signal quality that guarantees.
4. on the superincumbent normative foundation, we can give the SAS input definition of a standard of terminal device producer, require the same signal that designs the SAS of oneself of terminal device producer to meet the industrial specification of SAS-2, total system can not gone wrong at the physical signalling layer, obtain best performance and maximum compatibility.
Concrete testing procedure is as follows:
1) at first server host board is connected on the SAS measurement jig with USB interface by measurement jig connection testing tool, server host board is carried out the SAS signal source to be tested, testing tool uses TektronixDSA70804, the oscillograph of 8GHZ bandwidth, probe uses the connector of Tektronix TCA-SMA to add the standard cable of SMA, bandwidth 17.5GHZ, the signal rate of testing SA S differential signal DP/DN, signal UI, signal jitter, the signal positive level, the signal negative level, eye pattern, the rise time of DP/DN differential signal, the internal time of signal tilts; By test, guarantee that the SAS signal all satisfies the standard of TIA, and then guarantee the signal integrity of whole storage subsystem;
2) utilize electric impedance analyzer TDR to carry out the test of system's cable impedance, the requirement of 100ohm ± 10% is satisfied in the impedance of affirmation cable, and the impedance that makes cable is in standard, and cable analogy and transmission line make signal reflex can not take place.
The invention has the beneficial effects as follows: through top detailed signal testing, we can very clearly know the signals layer working condition of total system, meet some such as impedance do not match, problem such as signal interference, very clearly the orientation problem key is pointed out in those places, that link, according to phenomenon and signal testing analysis result, find final problem place and solution then.
Description of drawings
Fig. 1 is a test flow chart;
Fig. 2 is a SAS differential signal DP/DN opering characteristic of electric apparatus specification sheet;
Fig. 3 is the impedance definition list of SAS differential signal DP/DN and transmission cable, connector.
Embodiment
With reference to the accompanying drawings, content of the present invention is carried out a more detailed enforcement and does an elaboration:
This invention is exactly a SAS-2 industrial specification according to T10 technological associations, defines the standard of our product, and the industrial specification that should observe of total system.Total system comprises three parts: server, cable, terminal device (hard disk).
1. according to the specification of signals of SAS-2: it is defeated that we define oneself the SAS signal Tx of server end motherboard
2. go out for meeting the standard signal of 2.0 up-to-date versions of SAS;
3. according to the impedance requirement of SAS-2, the impedance that we define transmission cable meets the impedance requirement of SAS;
4. on the superincumbent normative foundation, require the standard compliant industrial specification of signal of the SAS of the same design of terminal device producer oneself;
Definition based on SAS storage system signal integrity, in the entire product system, be guiding with the signal quality, only catch the SAS-2 industrial specification, at first define the specification of signals that server host board meets SAS-2, making drive end is a high-grade signal source.
Definition based on SAS storage system signal integrity is equally in the entire product system, this transmission medium of cable is done a normalized definition, satisfy system-level impedance matching requirement, make signal undistorted, unreflectedly on this transmission medium, transmit.4, the definition based on SAS storage system signal integrity according to claim 1, its characteristic is equally in the entire product system, terminal device has been carried out interface definition, be one to meet the standard signal of SAS-2 standard promptly by the signal of cable end input, then in order to make total system show problems such as not producing shake, its Terminal Design also must be considered the scope and the characteristic of its input signal, designs according to the SAS-2 standard.
Utilize the SAS measurement jig Connection Service device motherboard and the testing tool of general band USB interface, server host board is carried out the SAS signal source to be tested, testing tool uses Tektronix DSA70804 (8GHZ bandwidth) oscillograph, the connector of probe use Tektronix TCA-SMA adds the standard cable (17.5GHZ bandwidth) of SMA, the signal rate of SAS differential signal DP/DN, signal UI, signal jitter, signal positive level, signal negative level, eye pattern; The rise time of DP/DN differential signal, internal time of signal tilt; By test, can guarantee whether the SAS signal all satisfies the standard of TIA, and then guarantee the signal integrity of whole storage subsystem.
Utilize TDR (electric impedance analyzer) to carry out the test of system's cable impedance.Mainly be to confirm whether the impedance of cable satisfies the requirement of 100ohm (± 10%).The impedance that makes cable so just can make cable analogy and transmission line in standard, make signal that phenomenons such as reflection can not take place.
Design specifications, signal definition, test data result etc. are informed terminal device manufacturer, allow them according to our designing requirement, finish the coupling of total system design, the final problems of Signal Integrity of resolution system fully.
Claims (1)
- Based on the method for SAS storage system measuring signal integrality, it is characterized in that 1, content measurement comprises1) according to the specification of signals of SAS-2: the SAS signal Tx that we define the server end motherboard of oneself is output as the standard signal that meets 2.0 up-to-date versions of SAS;2) according to the impedance requirement of SAS-2, the impedance that we define transmission cable meets the impedance requirement of SAS;Concrete testing procedure is as follows:1) at first server host board is connected on the SAS measurement jig with USB interface by measurement jig connection testing tool, server host board is carried out the SAS signal source to be tested, testing tool uses TektronixDSA70804, the oscillograph of 8GHZ bandwidth, probe uses the connector of Tektronix TCA-SMA to add the standard cable of SMA, bandwidth 17.5GHZ, the signal rate of testing SA S differential signal DP/DN, signal UI, signal jitter, the signal positive level, the signal negative level, eye pattern, the rise time of DP/DN differential signal, the internal time of signal tilts; By test, guarantee that the SAS signal all satisfies the standard of TIA, and then guarantee the signal integrity of whole storage subsystem;2) utilize electric impedance analyzer TDR to carry out the test of system's cable impedance, the requirement of 100ohm ± 10% is satisfied in the impedance of affirmation cable, and the impedance that makes cable is in standard, and cable analogy and transmission line make signal reflex can not take place.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253878A (en) * | 2010-05-19 | 2011-11-23 | 鸿富锦精密工业（深圳）有限公司 | Detecting device for SAS (Serial Attached SCSI (Small Computer System Interface)) output signals |
| CN102331962A (en) * | 2010-07-13 | 2012-01-25 | 鸿富锦精密工业（深圳）有限公司 | Serial attached small computer system interface (SAS) test tool |
| CN102866308A (en) * | 2011-07-07 | 2013-01-09 | 鸿富锦精密工业（深圳）有限公司 | SAS signal integrity analysis system and method |
| CN104794030A (en) * | 2014-01-21 | 2015-07-22 | 鸿富锦精密工业（深圳）有限公司 | SAS cable testing system and method |
| CN104820182A (en) * | 2015-05-05 | 2015-08-05 | 浪潮电子信息产业股份有限公司 | Signal integrity test method of SAS 12G RX link |
| CN106502844A (en) * | 2016-10-11 | 2017-03-15 | 郑州云海信息技术有限公司 | A kind of method of the sAS port bandwidths of test RAID memory Is O |
| CN107783027A (en) * | 2017-10-13 | 2018-03-09 | 福州创实讯联信息技术有限公司 | A kind of Integrity Testing of high-speed differential signal |
| CN108594018A (en) * | 2018-05-24 | 2018-09-28 | 郑州云海信息技术有限公司 | The method and system of usb signal line characteristic impedance in a kind of test board |
| CN111625409A (en) * | 2020-05-15 | 2020-09-04 | 广东浪潮大数据研究有限公司 | Adjustable signal test fixture of bandwidth |
-
2009
- 2009-09-04 CN CN200910018506A patent/CN101645030A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253878A (en) * | 2010-05-19 | 2011-11-23 | 鸿富锦精密工业（深圳）有限公司 | Detecting device for SAS (Serial Attached SCSI (Small Computer System Interface)) output signals |
| CN102253878B (en) * | 2010-05-19 | 2014-03-26 | 鸿富锦精密工业（深圳）有限公司 | Detecting device for SAS (Serial Attached SCSI (Small Computer System Interface)) output signals |
| CN102331962A (en) * | 2010-07-13 | 2012-01-25 | 鸿富锦精密工业（深圳）有限公司 | Serial attached small computer system interface (SAS) test tool |
| CN102866308A (en) * | 2011-07-07 | 2013-01-09 | 鸿富锦精密工业（深圳）有限公司 | SAS signal integrity analysis system and method |
| CN104794030A (en) * | 2014-01-21 | 2015-07-22 | 鸿富锦精密工业（深圳）有限公司 | SAS cable testing system and method |
| CN104820182A (en) * | 2015-05-05 | 2015-08-05 | 浪潮电子信息产业股份有限公司 | Signal integrity test method of SAS 12G RX link |
| CN106502844A (en) * | 2016-10-11 | 2017-03-15 | 郑州云海信息技术有限公司 | A kind of method of the sAS port bandwidths of test RAID memory Is O |
| CN107783027A (en) * | 2017-10-13 | 2018-03-09 | 福州创实讯联信息技术有限公司 | A kind of Integrity Testing of high-speed differential signal |
| CN107783027B (en) * | 2017-10-13 | 2019-10-18 | 福州创实讯联信息技术有限公司 | A kind of Integrity Testing of high-speed differential signal |
| CN108594018A (en) * | 2018-05-24 | 2018-09-28 | 郑州云海信息技术有限公司 | The method and system of usb signal line characteristic impedance in a kind of test board |
| CN111625409A (en) * | 2020-05-15 | 2020-09-04 | 广东浪潮大数据研究有限公司 | Adjustable signal test fixture of bandwidth |
| CN111625409B (en) * | 2020-05-15 | 2023-08-25 | 广东浪潮大数据研究有限公司 | Bandwidth-adjustable signal testing jig |
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Application publication date: 20100210 |