[CDBUG-talk] measuring HD activity
kempf at rpi.edu
Mon Dec 31 15:59:27 EST 2007
> Anyone know a good way to check for heavy hard drive thrashing?
> Ideally, I'd like to know which process is doing it, too.
> I have some servers at work that I think the users (middle and high
> school students, in this case) might be pushing kind of hard. They
> complain about performance issues, but they seem intermittent. I'm
> wondering if this will trace back to one or more users trying to
> really push HD reads and writes without realizing they were doing that.
> One suspicion is that they're trying to store their video editing
> projects in their networked home directories. Another is web caches
> being hit really bad in some way.
> Any suggestions?
I'd try systat -vmstat 1. It will at least indicate which of your disks
is getting hit, and how hard. As for what process? If these disks back a
network share, I'd just use something like iftop to see who's using the
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