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Solaris 9: Which process is taxing the disk?

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Operating Systems Solaris Solaris 9: Which process is taxing the disk?
# 1  
Old 11-03-2008
Solaris 9: Which process is taxing the disk?
What method do you recommend for determining which process is causing disk IO problems on Solaris 9? I have a disk which historically has service times of under 10ms, but is now averaging about 80ms.
# 2  
Old 11-03-2008
I can usually zero in with a combination of top and lsof. A process that is hammering a disk will be a top process and it will have files open on the file system in question. If I stop the process and disk usage drops off, I have my process. But it can be a bad disk too... soft errors result in very slow performance. Can also be that the box is out of memory.
# 3  
Old 11-03-2008
Similar to a failing disk there is also the possibility, if external storage is being used, that a controller cache has gone into write-through.
# 4  
Old 11-04-2008
Did you run the iostat -xcn to capture the read/write stats?
# 5  
Old 11-07-2008
The process was mysql. A new database with constant inserts was recently added. We're going to move mysql to its own disks.
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