How to change I/O schedule for block device throught udev?

Solution Unverified - Updated -

Issue

  • How to change nr_requests and queue_depth for block device through udev?
  • Want to set nr_requests and queue_depth as below, but the disk name may be changed some time, so want to achieve it by udev.
# echo 64 > /sys/block/sdab/device/queue_depth
# echo 1024 > /sys/block/sdab/queue/nr_requests

Environment

  • Red Hat Enterprise Linux 5

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