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тАО11-18-2007 12:43 PM
тАО11-18-2007 12:43 PM
I'd like to seek assistance in diagnosing an issue which happend recently. Disk i/o's began to drastically slowdown while we were doing backup/restore tests.
Config info:
- MSA30-SB, with 6x146GB 15K (RAID 1+0)+ 1x146GB 15K hotspare
- Smart Array 6402 SCSI card, 256MB cache
- RP4440-8, 16GB, 4-core CPU 1GHz
When I did some testings, I found that 'avwait' on 'sar -d' peaked to 18000, averaging to ~11000. CPU was at a 95% ave. idle value.
I tried to look for defunct processes and killed them which did not actually help.
The last thing I did was reboot the server, which seem to have 'cleaned' whatever it was which gave me high i/o. This was confirmed when I did the tests that I did before the reboot - true enough 'avwait' was nowhere near
the values above.
My problem is, how do I properly diagnose which might have caused this - if ever it does happen again. What are the things that I need to keep tags on so that i could better understand what was happening and prevent it.
Btw, there were no error logs on 'syslog' nor from 'sautil', cache batteries are OK also, which could refer to a HW failure
Regards
Solved! Go to Solution.
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тАО11-18-2007 11:35 PM
тАО11-18-2007 11:35 PM
Re: MSA30-SB Sudden Slowdown
Have you tried to update the HDD FW?
jk
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тАО11-18-2007 11:46 PM
тАО11-18-2007 11:46 PM
Re: MSA30-SB Sudden Slowdown
I haven't, do you have procedures that would tell me:
a. how to check current FW version
b. how to update FW version
Thanks for replying.
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тАО11-21-2007 10:38 AM
тАО11-21-2007 10:38 AM
Re: MSA30-SB Sudden Slowdown
thanks!
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тАО11-22-2007 12:47 AM
тАО11-22-2007 12:47 AM
SolutionDisk firmware for an MSA30 enclosure can be checked by the following commands:
1. Check the device file associated with the smart array controller using the following command:
ioscan -kfnd ciss
2. Enter the sautil
Disk firmwares can be updated using STM or sautil command. It is easier to use STM , if the disk firmware files have a .frm extension.
Thanks,
Shweta
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тАО11-22-2007 09:25 AM
тАО11-22-2007 09:25 AM
Re: MSA30-SB Sudden Slowdown
1. I have no data yet telling me that this will be the solution to this problem we have
2. any other diagnosis that I can use as support to tell my customers which can fix this
As of this time, i/o is back to normanl, but i still dread the day when we will encounter the same problem and Go-live is approaching.
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тАО11-27-2007 09:36 AM
тАО11-27-2007 09:36 AM
Re: MSA30-SB Sudden Slowdown
I still need to explain how this happened, any ideas? I'm not even sure if I would go for an HDD FW upgrade, the fact that I do not know what caused it.
really need this one sorted out.
thanks for the help.