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тАО05-02-2004 06:26 PM
тАО05-02-2004 06:26 PM
We noticed a poor performance on every RAID5-drive we created, especially when writing to the disk. Even the internal RAID on the server was much faster. Our 4 year old SAP-server with an RA4100 was almost as fast as this new MSA1000.
HP could not solve the problem. We swapped the HBA's, loaded new drivers, put a fiber switch in between, ... nothing could help us.
Is there anyone out there who has experienced the same performance drop with RAID5 ?
Note : we tested by creating an 10 Gb database with SQL2003, which took us 15 minutes or more. A Proliant ML530 test-machine did it in less than 3 minutes ! Other measurements (copying under Windows, restoring a tape, ...) confirmed the earlier tests.
Solved! Go to Solution.
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тАО05-02-2004 07:17 PM
тАО05-02-2004 07:17 PM
Solutionwe had a customer with a similar problem (bad write performance for RAID5 in an MSA1000 under Win2003). HP managed to solve it. There's an option in Windows 2003 Device Manager:
Please Enable Advanced Performance under the MSA1000 Volume SCSI Disk Device (or Compaq SecurePath Disk) Properties Policies Tab -> Optimize for Performance -> Enable Advanced Performance.
You might need to reboot the server(s) for this to take effect.
Hope this helps.
Regards,
Stephen
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тАО05-04-2004 01:06 AM
тАО05-04-2004 01:06 AM
Re: Write performance MSA1000 with RAID5
I was surprised however that write caching was enabled by default. This is a rather risky option, except when the MSA1000 provides for its own battery backup. We do have an UPS of course, but I would not like to rely on this alone.
It's surprising that 3 HP-guys that examined our problem for half a day could not give this answer. Good job Stephen !
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тАО05-04-2004 07:31 PM
тАО05-04-2004 07:31 PM
Re: Write performance MSA1000 with RAID5
Glad I could help.
Stephen
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тАО05-07-2004 11:16 PM
тАО05-07-2004 11:16 PM
Re: Write performance MSA1000 with RAID5
And will I do this same opperation?
Thank you!
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тАО05-09-2004 08:12 PM
тАО05-09-2004 08:12 PM
Re: Write performance MSA1000 with RAID5
I don't think this option exists under Win2K.
There's an option for write cache for the disk in device manager, although I don't know if it's recommended to enable this.
Check your cache settings in ACU.
Regards,
Stephen
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тАО08-26-2004 04:39 PM
тАО08-26-2004 04:39 PM
Re: Write performance MSA1000 with RAID5
We are currently still on Windows 2000 SP4 servers and we are impacted in similar ways on this FCA2101 and MSA1000 SAN infrastructure. Out of 4 servers, 2 with higher load (higher read and write access) are having major performance issue, which is affecting the service availability and reliability.
Is there any solution for the Windows 2000 platform?