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05-30-2006 05:51 PM
05-30-2006 05:51 PM
IO Issues
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05-30-2006 05:57 PM
05-30-2006 05:57 PM
Re: IO Issues
You can check basic disk functionality with cstm mstm or xstm exercize function.
The problem though is most likely because you have too much activity on the disk in question. Its a sysadmin, identify the problem and configure your way out of the problem situation.
I'm guessing there is an active database or something similar on the disk. Maybe write intensive.
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05-30-2006 06:33 PM
05-30-2006 06:33 PM
Re: IO Issues
#glance
then press (d key) at glance menu.it shows local and remote I/O activity.The I/O distribution can be viewed from the following:
Logical reads/writes,physical reads/writes.
The glance disk device report (u key) shows current and average utilization of each disk drive on the system.
(v key) shows disk activity on a perl logical volume basis.Physical I/O activity is shown with this logical volume report.
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05-30-2006 07:51 PM
05-30-2006 07:51 PM
Re: IO Issues
A disk being 100% does not imply any issue, it only informs that the disk is being accessed most of the time...and in your case, more than all the other disks, check what application is mounted on the VG which contains teh disk and see if there is any activity being carried out which has increased teh disk access..
regards
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05-30-2006 09:07 PM
05-30-2006 09:07 PM
Re: IO Issues
If you like to check the disk (c18t5d0 ) , you can check it with cstm.
1. Get the hardware path of the disk c18t5d0 , with # ioscan -fnC disk
2. # echo "sel path 0/1/... ;info;wait;infolog" | /usr/sbin/cstm
And check for Read error , Write error.
[ Where 0/1/... is the hardware path , it can be obtain from ioscan output. ]
Also check with diskinfo.
Cheers,
Raj.
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05-31-2006 01:45 AM
05-31-2006 01:45 AM
Re: IO Issues
The most important statistic to look for in "sar -d" output to ascertain if you've disk performance issues is the "avque" or disk queue field. Any value above 1.0 most often indicates the disk can no longer handle I/O requests.
Shalom.