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тАО10-21-2007 11:16 AM
тАО10-21-2007 11:16 AM
We are in dire need of advise on what to do to improve the performance for our disk array configuration:
- MAS30-SB
- 6 x 146GB 15KRPM on a RAID 1+0
- 1 x 146GB 15KRPM setup as spare
Out of this configuration, we have ~400GB usable disk space which was assigned to one VG only - VG01
Last Saturday, we imported ~400K of records, which took us about 30Hours to complete.
"sar -d" outputs always averages 95% busy. But doesn't have complain about the "avwait" value which sits mostly on 0.30 to be the max value.
Even today, when I did an uncompress "sar -d" reported 100% busy state throughout the process.
Can you advise us on what to check and which needs to be done to give us better performance?
Thank you.
Solved! Go to Solution.
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тАО10-21-2007 12:55 PM
тАО10-21-2007 12:55 PM
Re: Slow Disk Performance on an MSA30-SB
saconfig /dev/cissX output displays:
******************** SmartArray RAID Controller /dev/ciss4 ********************
Auto-Fail Missing Disks at Boot = enabled
Cache Configuration Status = write cache temporarily disabled (code=1)
Cache Ratio = 75% Read / 25% Write
I think we need to enable 'write cache' on this box. Don't we? and how can we do that?
Thanks!
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тАО10-21-2007 07:20 PM
тАО10-21-2007 07:20 PM
Re: Slow Disk Performance on an MSA30-SB
If the write cache is disabled, then you probably haven't got the BBWC (Battery Backed Write Cache) option installed on your SmartArray controller.
Try installing that, and you write performance should improve greatly. If it is already installed, maybe the battery is discharged, or faulty.
Hope this helps,
Regards,
Rob
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тАО10-21-2007 07:47 PM
тАО10-21-2007 07:47 PM
Re: Slow Disk Performance on an MSA30-SB
We actually have the BBWC installed, I just discovered that it has a FAILED status on it, I've replaced it a couple of times already, the thing is, after replacing it with a new one, it gives an "OK" status, also enable write cache, but after a while - say 5 minutes, the battery status returns to a "FAILED" state, and write cache is temporarily disabled.
I did a couple of research and it was advised that I upgrade SA6402's firmware above 2.34 - which is my current FW version, because this happens on FW versions lower than 2.48. I tried getting the FW, but the URL which points to it is unuseful.
Thanks.
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тАО10-21-2007 08:38 PM
тАО10-21-2007 08:38 PM
Re: Slow Disk Performance on an MSA30-SB
There's a fair few downloads from here:
http://h18007.www1.hp.com/support/files/storage/us/family/model/5618.html?submit.y=4&submit.x=7тМй=en&cc=us
Cheers,
Rob
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тАО10-21-2007 08:52 PM
тАО10-21-2007 08:52 PM
Re: Slow Disk Performance on an MSA30-SB
I'm on HP-UX 11.11, I've seen that site, the URL which points to cyborgXXX.gz says file does not exist.
Would you know any other sources I can get the firmware from?
Regards
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тАО10-21-2007 09:04 PM
тАО10-21-2007 09:04 PM
Solution- Mark as New
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тАО10-22-2007 10:39 AM
тАО10-22-2007 10:39 AM
Re: Slow Disk Performance on an MSA30-SB
Regards
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тАО10-22-2007 07:08 PM
тАО10-22-2007 07:08 PM
Re: Slow Disk Performance on an MSA30-SB
You might be better off asking in the Integrity forum here:
http://forums1.itrc.hp.com/service/forums/categoryhome.do?categoryId=275
Just checking, it is an Integrity server isn't it ?
Cheers,
Rob
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тАО10-22-2007 07:14 PM
тАО10-22-2007 07:14 PM
Re: Slow Disk Performance on an MSA30-SB
But the problem did not go away. This afternoon I swapped batteries with another SA6402 and it turned out I was replacing the wrong battery module. Right now I think I've got the proper setup for the battery, but when I checked, the battery status is "BELOW REFERENCE VOLTAGE"... The cache module's LED indicators are on a steady green light which tells me that: "The cache batteries are charging."
My question is, do you have an idea how long does it take to fully charge?
Thanks!