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10-25-2005 01:45 PM
10-25-2005 01:45 PM
I/O intensive on root disk
I found the root disk has intensive IO (always util 100%). Especially on root & var FS. Does anyone has idea what causing the problem.
The attached is the capture from glance.
Thanks,
Simon
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10-25-2005 02:21 PM
10-25-2005 02:21 PM
Re: I/O intensive on root disk
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10-25-2005 02:22 PM
10-25-2005 02:22 PM
Re: I/O intensive on root disk
sar -d output and what's top showing?
-denver
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10-25-2005 02:29 PM
10-25-2005 02:29 PM
Re: I/O intensive on root disk
Could you send us :
# sar -d
# sar -b
# sar -u
# iostat
# vmstat 5 30
# ioscan -nfCdisk
Also send the file below :
/var/opt/resmon/log/event.log
/var/adm/syslog/syslog.log
Wait for your update.
Cheers,
AW
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10-25-2005 04:03 PM
10-25-2005 04:03 PM
Re: I/O intensive on root disk
Run glance
Type 'o'
Select 1 from 'Go to 1) Process; 2) Transaction; 3) Thread option screen(1) :'
Use arrow keys to scroll down to 'Sort key (name/cpu/disk/rss):'
Type 'disk' and press
Answer 'y' to 'Set your user defaults to these values (y/n)?'
This will sort processes by 'Disk IO Rate', which will identify disk IO intensive processes at the top of the list.
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10-28-2005 02:39 AM
10-28-2005 02:39 AM
Re: I/O intensive on root disk
- root disks are c0t2d0 & c56t2d0 (mirrored)
- IO hitting / and /var
- I don't think it is caused by swapping, swap usage is low.
- have sorted the top IO processes, they are oracle processes and hitting oracle datafiles only (raw devices @EMC frame).
- no error reported on syslog and ems log.
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10-28-2005 02:48 AM
10-28-2005 02:48 AM
Re: I/O intensive on root disk
I am theorizing you probably have big system disks (73Giggers +) and you have Oracle software on the same disk. It may also be you have logs (active) that are being heavily hit and it also resides on your root/boot/os disks.
Your "sar -d" and "sar -b" logs do appear "healthy" to me.
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10-28-2005 03:15 AM
10-28-2005 03:15 AM
Re: I/O intensive on root disk
Thanks
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10-28-2005 03:18 AM
10-28-2005 03:18 AM
Re: I/O intensive on root disk
If that's the case, do you have any non-OS/system stuff that resides on / and that's possibly using /var intensely?
What processes do glance show you as the heaviest I/O users?
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10-28-2005 03:26 AM
10-28-2005 03:26 AM