Hi list !
We have a very busy webserver hosted in a clustered environment where the
document root and data is on a GFS2 partition off a fiber-attached disk
array.
Now on busy moments, I can see in htop, nmon that there is a fair percentage
of cpu that is waiting for I/O. In nmon, I can spot that the most busy block
device correspond to our gfs2 partition where many times, it shows that it's
100% busy and is read all along.
Now, I want to know what files are being waited for. With lsof I can get a
listing of open files, but it doesn't gives me if a file is just opended in
ram or if it's being waited for...
What tools besides lsof, nmon, htop, atop can help me find that info ?
I am under RHEL/CentOS 6.1.
Thanks
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