topic Re: High DISK Utilization in Operating System - HP-UX

High DISK Utilization

Mike_145 — Tue, 14 Jun 2005 18:08:20 GMT

On our SAN I am seeing two of the disk with continual 98% utilization on them through sar command. There are about a 1/2 dozen file systems that have logical volumes assigned extents on these two disk. Is there a way to figure out exactly which logical volumes are the ones being utilized the hardest that we may be able to split them out ?? We do not have glance on this server...

Re: High DISK Utilization

Mel Burslan — Tue, 14 Jun 2005 18:28:54 GMT

I am not sure if this program has any value to you, but it may worth to take a look here:

http://hpux.cs.utah.edu/hppd/hpux/X11/Networking/xperfmon-2.8/

it has disk transfer activity monitors as well, even though the tool is catalogued under 'networking' branch of utilities.

Hope it helps

Re: High DISK Utilization

lawrenzo — Wed, 15 Jun 2005 00:29:34 GMT

use this command to check for physical disk problems i/o errors

dd if=/dev/rdsk/ of=/dev/null bs=64k

This may show a problem with disk.

Re: High DISK Utilization

Isralyn Manalac_1 — Wed, 15 Jun 2005 02:27:26 GMT

Hi Mike,

I've attached herewith an Intro to Performance and Tuning. Excerpt for disk utilization: if avwait is bigger than avserv, then there is disk bottleneck. Identifying which logical volumes are utilized the most won't help resolve the issue because the LV may be spread across different disks. Please see attached file for recommendations on improving I/O.

Good luck!

Regards,

Isralyn

Re: High DISK Utilization

Mike_145 — Wed, 15 Jun 2005 07:30:17 GMT

Mel, when trying to run xperfmon I receive: no /stand/vmunix namelist

Re: High DISK Utilization

Mel Burslan — Wed, 15 Jun 2005 10:05:45 GMT

Mike,

I personally have not ever used this utility. I just have heard it being mentioned by another colleague of mine in one of my past jobs. Hence I am not sure what this error message can be related to but, a quick look to the man page on the archive tells me, this applcation needs to be owned and run by root (or at least its suid bit needs to be set) for proper operation.

It might worth trying. Other than that, I don't know what to say. It si so old, its home page pointed from the software archive does not even exist.