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Searching (grep) in file /var/log/boot.msg
for phrase 'io scheduler' will find a line like:
<4>Using deadline io scheduler
which returns the name of the scheduler in use.
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The I/O scheduler is selected with the boot parameter elevator
in zipl.conf
[ipl]
target = /boot/zipl
image = /boot/image
ramdisk = /boot/initrd
parameters = "maxcpus=8 dasd=5000 root=/dev/dasda1
elevator=deadline"
where elevator ::= as | deadline | cfq | noop
For more details see /usr/src/linux/Documentation/kernel-parameters.txt.
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