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//lib/udev/mpath-iosched.sh
#!/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
