topic Re: Queue_dept in HPE EVA Storage

Queue_dept

SAN_8 — Sun, 03 Sep 2006 03:06:03 GMT

Hi I presented a vdisk from EVA 5000(VCS 3.028) to AIX 5.3 using Antemeta. Now The host type is IBM AIX i selected in EVA side host type and one more thing in AIX the lun showing Queue_depth 8 can we increase this parameter and what is the range.

Pls tell me what what is the type i have to give in EVA host type

Re: Queue_dept

sajeer_2 — Sun, 03 Sep 2006 06:46:01 GMT

To change the Queue depth,

#chdev -l hdisknum -a q_type=simple -a queue_depth=NewValue

More Info from manual

Disk Drive Queue Depth

Purpose: Maximum number of requests the disk device can hold in its queue.

Values: Default: IBM disks=3, Range: N/A
Default: Non-IBM disks=0, Range: specified by manufacturer.

Display: lsattr -E -l hdiskn

Change: chdev -l hdiskn -a q_type=simple -a queue_depth=NewValue

Change is effective immediately and is permanent. If the -T flag is used, the change is immediate and lasts until the next boot. If the -P flag is used, the change is deferred until the next boot, and is permanent.

Diagnosis: N/A
Tuning: If the non-IBM disk drive is capable of request queuing, this change should be made to ensure that the operating system takes advantage of the capability.

Re: Queue_dept

sajeer_2 — Sun, 03 Sep 2006 06:48:18 GMT

Also see this post,

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1055954

sajeer

Re: Queue_dept

SAN_8 — Sun, 03 Sep 2006 07:23:57 GMT

HERE MY QUERY IS , I PRESENTED ONE LUN (350 GB) TO THE AIX SERVER FROM SAN HP EVA 5000 AND THE QUEUE_DEPTH SHOWING 8 THERE CAN I CHANGE THAT TO MAXIMUM TO WHAT RATE