Recommended RHEL 5.x System and IBRIX Server Tunings

Recommended RHEL 5.x System and IBRIX
Server Tunings
Solution ID: 95
Created: 3/9/2009
DETAILS:
From your FM run the following sequence for each Segserver:
ibrix_host_tune -S -h HOSTNAME -o rw_op_interval=200
ibrix_host_tune -S -h HOSTNAME -o max_request_segment=16384
ibrix_host_tune -S -h HOSTNAME -o max_pg_host=49152 (Exists in IBRIX v4.x
only)
in /etc/sysclt.conf add following 3 tunables oom, panic oops and kernel.panic
#oom killer
vm.min_free_kbytes = 20480
kernel.panic_on_oops = 1
# Reboot after dump, waits 10 seconds then reboots
kernel.panic = 10
Run the following command and then stick the following line in the /etc/rc.local file to
make it persistant after reboots:
"for n in /sys/block/sd*/queue/iosched/slice_idle ; do echo 0 > $n ; done"
Please remember to remove any of our "old" TCP tunings in your /etc/sysctl.conf file and
reboot. They are no longer necessary as RHEL 5.x automatically tunes for TCP
dynamically.
IBRIX_S00000095.pdf
Last Modified: 3/9/2009