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X4-8/X5-2/X5-2L/X5-4/X5-8/X6-2/X6-2L With an Aspen Internal RAID Card (MR 9361-8i) May Experience RAID Performance Degradation If Not Set To Write-Back On All Virtual Drives (Doc ID 2748281.1)

Last updated on FEBRUARY 02, 2021

Applies to:

Oracle Server X6-2L - Version All Versions to All Versions [Release All Releases]
Oracle Server X6-2 - Version All Versions to All Versions [Release All Releases]
Sun Server X4-8 - Version All Versions to All Versions [Release All Releases]
Oracle Server X5-2 - Version All Versions to All Versions [Release All Releases]
Oracle Server X5-2L - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

Customer reports a performance issue that started after a previous replacement of their MR 9361-8i internal SAS RAID card.

Host 1: /r1-intdsk2 #  lmdd if=internal of=./test.XXXX count=1000000 fsync=1
8192.0000 MB in 141.0826 secs, 58.0653 MB/sec
Host 1: /r1-intdsk2 #  lmdd if=internal of=./test.XXXX count=1000000 fsync=1
8192.0000 MB in 143.9212 secs, 56.9200 MB/sec


For comparison, this is another X6 server not having any disk performance issues.

Host 2: /r10-intdsk2 #  lmdd if=internal of=./test.XXXX count=1000000 fsync=1
8192.0000 MB in 58.9490 secs, 138.9677 MB/sec
Host 2: /r10-intdsk2 #  lmdd if=internal of=./test.XXXX count=1000000 fsync=1
8192.0000 MB in 62.0285 secs, 132.0682 MB/sec

There is a marked difference in performance.

 

Also the bus link speed/type might show as lower than what is needed (in this case the type was SATA instead of SAS and the link speed was down to 3G instead of 12G):

Changes

 Firmware was upgraded/downgraded and the BIOS was checked and verified that all the drives are set to Auto negotiation speed but did not resolve the issue.

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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