IO Issue

bostonthunder777 · 11-09-2007, 10:22 AM

We have been having a host with high I/O and iostat shows high writes on the root disk. Is there command/util to find which process is writing files to disk?

Thanks,

bostonthunder777 · 11-09-2007, 03:42 PM

Anyone got this??

osor · 11-09-2007, 04:30 PM

Perhaps lsof?

bostonthunder777 · 11-10-2007, 05:58 PM

Nahh.. lsof lists only open files.

syg00 · 11-10-2007, 09:21 PM

Have a look at taskstats - needs to be turned on in the kernel config, and (presumably) adds overhead.
Some doco at ../Documentation/accounting

FraGGod · 11-10-2007, 10:50 PM

atop can show you i/o activity of a process or group of similar processes (like apache childs swarm)

syg00 · 11-11-2007, 12:51 AM

Last I looked, atop needed the kernel patch. Might be hard to do in an enterprise.

bostonthunder777 · 11-11-2007, 06:16 PM

I cant add additional load on the system. ALready we have a excuse banner on the home page :-)

Lemme give some background.. Its IMAP hosts and most the data is mails(small files). Currently ext3, but tested with reiser and vxfs.

bostonthunder777 · 11-11-2007, 06:39 PM

mine is x64. atop seems to work only on x86