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setting the queue_depth

 
Peternt
Regular Advisor

setting the queue_depth

Hi,
I have a disk in the server1. This disk is a lun from a storage array. The device in the server1 is c10t1d5.
I set the queue_depth in this disk by executing the command:
scsictl -m queue_depth=32 /dev/rdsk/c24t0d1
I proved the change command with:
scsictl -m queue_depth c24t0d1
queue_depth = 32

Later, I present the same disk to a server2. In this case the device is c24t0d1

That means that the same disk is presented to two servers.

But, when I verify the queue_depth in the server2, I see the default queue_depth = 8

Why is this behavior ?

Thanks in advance

Roger

Roger
3 REPLIES
Peternt
Regular Advisor

Re: setting the queue_depth

Also, I realize that this configuration is not persistent after reboot
I use hp-ux 11i v1

Roger
Matti_Kurkela
Honored Contributor

Re: setting the queue_depth

The queue depth is not the property of the disk/LUN, but of the server/HBA that is accessing it.

MK
Peternt
Regular Advisor

Re: setting the queue_depth

Matti,

 

The queue depth can setting for each disk using the command scsictl -m
I have tested and verified that these settings are stored in the operating system kernel.
So, when you import the disc on another system, this configuration is lost.

regards,
Roger

Roger