Test Description
The tools checks that all NFINIDAT scsi-disk devices uses the noop I/O scheduler.
Linux provides a mechanism over sysfs to control the current I/O scheduler for every block devices, but no mechanism to make this change persistent.
To make it stick for all NFINIDAT devices, current and future ones, and across reboots, a udev rule must be added.
This test case fails if:
- The tool checks our udev rule exists for setting the noop I/O scheduler for NFINIDAT sd devices
- The tool checks that active I/O scheduler for all NFINIDAT sd devices is noop
This test case passes if:
All NFINIDAT sd devices uses the noop I/O scheduler, and the udev rule exists
How to fix this test
Automatic fix
The tool follows the instructions mentioned below in the manual fix
Manual fix
To install the udev rule:
on legacy udev systems, such as redhat-6, suse-11 and their equivalents:rite the following contents to
/etc/udev/rules.d/41-infinidat-io-scheduler.rules:ACTION=="add|change", KERNEL=="sd[a-z]*", SYSFS{vendor}=="NFINIDAT", RUN+="/bin/sh -c 'echo noop > /sys$DEVPATH/queue/scheduler'"
on systemd-based systems, such as redhat-7, ubuntu-14.04 and their equivalents:rite the following contents to
/lib/udev/rules.d/99-infinidat-io-scheduler.rules:ACTION=="add|change", KERNEL=="sd[a-z]*", ENV{ID_VENDOR}=="NFINIDAT" RUN+="/bin/sh -c 'echo noop > /sys$env{DEVPATH}/queue/scheduler'"
To change the active I/O scheduler for sd devices, run
echo noop > /sys/block/sdX/queue/scheduler
for every NIFNIDAT device.
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