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Top Forums UNIX for Advanced & Expert Users identify the unix process performing high disk i/o reads and writes Post 302275378 by agn on Saturday 10th of January 2009 01:46:30 AM
Old 01-10-2009
iostat alone won't tell you the process which is doing the most I/O. A combination of iostat -p and lsof should give you what you're looking for.
 

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nfsiostat(8)						      System Manager's Manual						      nfsiostat(8)

NAME
nfsiostat - Emulate iostat for NFS mount points using /proc/self/mountstats SYNOPSIS
nfsiostat [[<interval>] [<count>]] [<options>][<mount_point>] DESCRIPTION
The nfsiostat command displays NFS client per-mount statisitics. <interval> specifies the amount of time in seconds between each report. The first report contains statistics for the time since each file sys- tem was mounted. Each subsequent report contains statistics collected during the interval since the previous report. <count> If the <count> parameter is specified, the value of <count> determines the number of reports generated at <interval> seconds apart. if the interval parameter is specified without the <count> parameter, the command generates reports continuously. <options> Define below <mount_point> If one or more <mount point> names are specified, statistics for only these mount points will be displayed. Otherwise, all NFS mount points on the client are listed. OPTIONS
-a or --attr displays statistics related to the attribute cache -d or --dir displays statistics related to directory operations -h or --help shows help message and exit -l LIST or --list=LIST only print stats for first LIST mount points -p or --page displays statistics related to the page cache -s or --sort Sort NFS mount points by ops/second --version show program's version number and exit FILES
/proc/self/mountstats SEE ALSO
iostat(8), mountstats(8), nfsstat(8) AUTHOR
Chuck Lever <chuck.lever@oracle.com> 15 Apr 2010 nfsiostat(8)
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