Disk performance improvement on HPUX 11.31 servers with max_q_depth parameter .

 Configure the max_q_depth in HPUX 11.31 servers for better disk performance .

Detailed plan .

1) login to the server as root and start script logging
script /var/adm/install-logs/CRQ.scriptlog
2.) verify the successfull ignite backup status .
#-> tail /usr/local/log/ignite.txt

3.) Check the current disk usage .

sar -d 1 8

4.) check the current value of the disk tunables .

scsimgr get_attr -D /dev/rdisk/disk241 -a max_q_depth
scsimgr get_attr -D /dev/rdisk/disk242 -a max_q_depth
scsimgr get_attr -D /dev/rdisk/disk151 -a max_q_depth
scsimgr get_attr -D /dev/rdisk/disk152 -a max_q_depth

5. ) UPdate the value of max_q_depth tunable to 16

scsimgr save_attr -D /dev/rdisk/disk241 -a max_q_depth=16
scsimgr save_attr -D /dev/rdisk/disk242 -a max_q_depth=16
scsimgr save_attr -D /dev/rdisk/disk151 -a max_q_depth=16
scsimgr save_attr -D /dev/rdisk/disk152 -a max_q_depth=16

6. ) Verify the new values after changing .
scsimgr get_attr -D /dev/rdisk/disk241 -a max_q_depth
scsimgr get_attr -D /dev/rdisk/disk242 -a max_q_depth
scsimgr get_attr -D /dev/rdisk/disk151 -a max_q_depth
scsimgr get_attr -D /dev/rdisk/disk152 -a max_q_depth

7.) check the disk utlizations .

sar -d 1 9

8.) exit