topic SCSI queue for disk array in HPE 9000 and HPE e3000 Servers

SCSI queue for disk array

Prashant Zanwar_4 — Fri, 10 Sep 2004 10:08:59 GMT

hi,
How to find SCSI queue for disk array using glance.? And what valus it should posses..when it is too large? Please advise
Thanks and regards
Prashant

Re: SCSI queue for disk array

Bill Hassell — Sun, 12 Sep 2004 18:40:52 GMT

When running Glance, there are many 1-character commands that will take you to a specific measurement. Just type the ? character to see the list. The display you want is IO by Disk and can be seen by typing the letter u.

As far as a recommended value, queue depths might be just fine at 3 to 5 for a disk array with a very small cache (less than 500 megs) while 10 to 20 might be just fine for a big array controller with Gigabytes of cache memory. As with all performance questions, the best solution is to optimize the application and use Glance to monitor the results.

Re: SCSI queue for disk array

Ted Buis — Mon, 13 Sep 2004 19:50:31 GMT

See the scsictl command for scsi queue depth from the OS perspective for a device. It's size will depend on the array and what else the array is handling.