ceph-udev-disk-scheduler.rules

ceph-udev-disk-scheduler.rules

# udev rule to set disk schedulers for Ceph
# For spinning disks we want the CFQ scheduler so that we can set
# priorities on client and recovery I/O threads
#
# Author: Wido den Hollander <wido@42on.com>
# Date: July 2015

# Use deadline for SSDs
ACTION=="add|change", KERNEL=="sd[a-z]*", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="deadline"

# Use CFQ for HDDs
ACTION=="add|change", KERNEL=="sd[a-z]*", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="cfq"