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тАО02-26-2010 02:57 PM
тАО02-26-2010 02:57 PM
High i/o on lunpath
I'm having high i/o on disk/lunpath even when the filesystem is unmounted/mounted.
Any ideas why?
root@hnamht11:/> fuser /backup
/backup:
root@hnamht11:/> umount /backup
root@hnamht11:/> iostat | awk '{print $2 " " $1}'| sort -n |tail -1
4068 disk274
root@hnamht11:/> mount /backup
root@hnamht11:/> bdf /backup
Filesystem kbytes used avail %used Mounted on
/dev/backupvg/bck11lv01
937164800 813538807 115899434 88% /backup
root@hnamht11:/> vgdisplay -v|egrep 'backupvg|disk274'
VG Name /dev/backupvg
LV Name /dev/backupvg/bck11lv01
PV Name /dev/disk/disk274
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тАО02-26-2010 11:49 PM
тАО02-26-2010 11:49 PM
Re: High i/o on lunpath
sar -d 5 5
Are there any other logical volume in the /dev/disk/disk274?
Are there any disk activity when you both umount the file system and make the volume group offline?
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тАО02-27-2010 02:52 AM
тАО02-27-2010 02:52 AM
Re: High i/o on lunpath
BR,
Kapil+
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тАО02-27-2010 05:20 AM
тАО02-27-2010 05:20 AM
Re: High i/o on lunpath
# lsof +D /directory
,,,reveal? (* Note: Might +L as well for +D /dir +L *)
Also, this is an indication of a runaway process, where the Parent PPID is dead but the child PID is still alive, orphaned but not zombied and still writing.
You may have to reboot if you can't find it.
This also works, create a 'new' reference file with the most recent time stamp on the system
# touch /var/tmp/myref
# find /apps -xdev -type f -newer /var/tmp/myref
...-newer will now display all files written to after the 'new' reference file. So if you do have a runaway process, you'll catch it in the act.
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тАО02-28-2010 09:33 AM
тАО02-28-2010 09:33 AM
Re: High i/o on lunpath
There is multiple disks in the VG, and only one logical volume.
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тАО02-28-2010 10:53 AM
тАО02-28-2010 10:53 AM
Re: High i/o on lunpath
For monitoring disk performance sar and glance are major tools for me. I never use iostat, i dont know how accurate it is...
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тАО02-28-2010 10:53 AM
тАО02-28-2010 10:53 AM
Re: High i/o on lunpath
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тАО02-28-2010 11:58 AM
тАО02-28-2010 11:58 AM
Re: High i/o on lunpath
Use iostat on Ia64 based system, it does not work on PA-Risc systems. 'Sar' is reliable on both, as is glance.
Please paste in the sar -d 5 5 report. A disk bottleneck is defined when avwait > avserv, a phenomena usually always seen on vg00'd disks, (* o/s disks *), but not else where.
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тАО02-28-2010 11:27 PM
тАО02-28-2010 11:27 PM
Re: High i/o on lunpath
iostat 10 10
the first set of numbers produced were meaningless...
so I would guess the numbers ypu are getting from iostat are incorrect for what you are looking at...
If only the man page was clearer...
HTH
Duncan
I am an HPE Employee