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тАО07-01-2009 02:11 AM
тАО07-01-2009 02:11 AM
Greetings
I have an oracle box that yesterday when in very high i/o wait on the / partition oracle has seperate partitions
iostat and sar confirmed that yes there was high usage on the disk
There were no backups nor unexpected processes running I turned off hpasm and our monitoring software but no joy...
I suppose my question is how does one locate the culprit that caused this...
Thanking you
I have an oracle box that yesterday when in very high i/o wait on the / partition oracle has seperate partitions
iostat and sar confirmed that yes there was high usage on the disk
There were no backups nor unexpected processes running I turned off hpasm and our monitoring software but no joy...
I suppose my question is how does one locate the culprit that caused this...
Thanking you
Solved! Go to Solution.
3 REPLIES 3
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тАО07-01-2009 02:56 AM
тАО07-01-2009 02:56 AM
Solution
Shalom,
I would stop and start the oracle database.
First place I would look would be at the database.
One ugly user interactive sql statement can be the cause of this.
Poor database layout could be it.
Its a fishing expedition. Take a look at disk layout. Look for index and rollback an data being on a raid 5 and being write intensive.
Look for hardware issues with the disk.
Keep looking until you find a cause.
SEP
I would stop and start the oracle database.
First place I would look would be at the database.
One ugly user interactive sql statement can be the cause of this.
Poor database layout could be it.
Its a fishing expedition. Take a look at disk layout. Look for index and rollback an data being on a raid 5 and being write intensive.
Look for hardware issues with the disk.
Keep looking until you find a cause.
SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО07-01-2009 04:15 AM
тАО07-01-2009 04:15 AM
Re: Excessive i/o wait
Hi.
To find out which process is responsible for I/O you can use two methods:
1. Use blktrace tools (needs CONFIG_BLK_DEV_IO_TRACE kernel option)
2. Use block_dump method, explained in kernel docs (laptop-mode.txt) - turn off syslog etc. before enabling this.
Regards,
Goran
To find out which process is responsible for I/O you can use two methods:
1. Use blktrace tools (needs CONFIG_BLK_DEV_IO_TRACE kernel option)
2. Use block_dump method, explained in kernel docs (laptop-mode.txt) - turn off syslog etc. before enabling this.
Regards,
Goran
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тАО07-01-2009 05:19 AM
тАО07-01-2009 05:19 AM
Re: Excessive i/o wait
Many thanks I shall test that out...
--Sherbert
--Sherbert
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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