#!/bin/bash
#
# For the request-based multipath driver, the I/O scheduler runs on the
# multipath device, not the underlying "slave" devices. This script
# checks the ID_BUS attribute for each of the slave devices. If it finds
# an ata device, it leaves the I/O scheduler tunings alone. For any other
# device, we tune the I/O scheduler to try to keep the device busy.
#
PATH=/sbin:$PATH
needs_tuning=1
for slave in /sys${DEVPATH}/slaves/*; do
bus_type=$(udevadm info --query=property --path=$slave | grep ID_BUS | awk -F= '{print $2}')
if [ "$bus_type" = "ata" ]; then
needs_tuning=0
break
fi
done
if [ $needs_tuning -eq 1 ]; then
echo 0 > /sys${DEVPATH}/queue/iosched/slice_idle
echo 32 > /sys${DEVPATH}/queue/iosched/quantum
fi
exit 0
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