Performance Degradation Reported in Controller Firmware Releases 4.1x on Sun StorEdge 3310/351x Arrays for All RAIDTypes and Certain Patterns of I/O |
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| Category : | Availability |
| Release Phase : | Resolved |
| Product : | Sun StorageTek 3310 SCSI Array
Sun StorageTek 3510 FC Array
Sun StorageTek 3511 SATA Array
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| Bug Id : | 6246969, 6341196
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| Date of Workaround Release : | 12-JAN-2006
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| Date of Resolved Release : | 14-MAR-2007
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Performance Degradation Reported in Controller Firmware Releases 4.1x on Sun StorEdge 3310/351x Arrays for All RAIDTypes and Certain Patterns of I/O
Impact
On Sun StorEdge 3310/351x Arrays, performance degradation has been reported for all RAID types and for certain patterns of I/O, due to the enhancement of the data integrity checking mechanisms in controller firmware release 4.1x.
Note: Depending on the application and usage, some systems may not experience a performance impact.
Contributing Factors
This issue can occur on the following platforms:
- Sun StorEdge 3310 array with firmware revision 4.13b or higher
- Sun StorEdge 3510 array with firmware revision 4.11i or higher
- Sun StorEdge 3511 array with firmware revision 4.11i or higher
A latency was introduced into the 4.1x controller firmware code due to the added overhead of a data integrity enhancement which performs extended cache data error checking. This added enhancement has additional command overhead which adds a latency for both read and write commands in the controller firmware.
Symptoms
SE3310, SE3510 and SE3511 systems may experience performance degradation of varying degrees on systems running revisions 4.1x of the controller firmware.
Workaround
Depending on your specific configuration or environment, one option is to tune applications and host driver stacks to issue the largest reads and maintain the highest queue depths possible. (There may be other tuning options available for your specific configuration).
Resolution
Please refer to the "Sun StorEdge 3510 FC and Sun StorEdge 3511 SATA Array Release Notes" at:
http://onesearch.sun.com/search/docs/index.jsp?col=docs_en&locale=en&qt=817-6597
and the section:
"Performance Implications of Migrating to Firmware Version 4.1x"
to determine whether this issue may affect your specific systems configurations or firmware upgrade, and what options may be available.
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Modification History16-Jun-2008; Updated Resolution section for correct URL to Support Docs
Date: 26-JAN-2006
26-Jan-2006:
- Updated Contributing Factors section
Date: 01-AUG-2006
01-Aug-2006:
- Updated Relief/Workaround section
Date: 14-MAR-2007
- Updated Relief/Workaround and Resolution sections
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