High I/O on /usr and /opt

[Roberto Volsa]

Hi all,
using Performance Viewer i checked for file system I/O and found high throughtput to/from /usr and /opt.
Is this normal?
Thanx
Roberto

[Bernie Vande Griend]

What type of I/O, reads or writes? The # of reads in /usr being relatively high is normal. /opt reads could also be high depending on what applications you have there and how often they are used. Normally you would have little if any writes to /usr or /opt. If there are then I would definitely try to pinpoint it being looking at the specific processes that are running during high I/O times. You can do this for reads as well if they seem really high. I would also be concerned about read I/O if they vary greatly during the day, for the most part they should be consistent with the traffic of your users.

[A. Clay Stephenson]

Hi:

I would expect quite a bit of read activity from both of these filesystems; I would expect very little write activity. Typically these filesystems are not the big i/o hogs but if you have a lightly loaded machine the activity in these filesystems may appear to be more of a problem than they really are only in the sense that many programs and libraries are being loaded from these filesystems. If you truly have a disk bottoleneck, you might consider moving these filesystems to another volume group. Only /,stand, and primary swap must be in the boot volume group.

[Praveen Bezawada]

Hi
Check if the high IO is physical IO or logical IO. If it's only logical IO which is high , i wouldn't worry too much.

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