How to set I/O scheduler of a block device using udev rules | monline

How to set I/O scheduler of a block device using udev rules

Sat, 2012.01.07 - 02:03 — müzso

http://www.switchroot.com/how-to-reduce-the-io-wait-time-input-output-wait-time-...

Eg. to set scheduler of iSCSI and FiberChannel devices:

[root@server ~]# vi /etc/udev/rules.d/95-san.rules



# To Set "noop" as I/O scheduler for iSCSI and Fiber Channel devices
ACTION=="add", ENV{ID_FS_USAGE}!="filesystem", ENV{ID_PATH}=="*-iscsi-*", RUN+="/bin/sh -c 'echo noop > /sys$DEVPATH/queue/scheduler'"
ACTION=="add", ENV{ID_FS_USAGE}!="filesystem", ENV{ID_PATH}=="*-fc-*", RUN+="/bin/sh -c 'echo noop > /sys$DEVPATH/queue/scheduler'"