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.

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-5, suse-11 and their equivalents: write the following contents to /etc/udev/rules.d/39-infinidat-io-scheduler.rules:

  ACTION=="add|change", KERNEL=="sd[a-z]*", SYSFS{vendor}=="NFINIDAT", RUN+="/bin/sh -c 'echo noop > /sys$DEVPATH/queue/scheduler'"
  ACTION=="add|change", KERNEL=="dm-*", RUN+="/bin/bash -c 'export DEV=`/bin/basename $DEVPATH`; export MPATH=`cat /sys/block/$$DEV/slaves/sd*/device/vendor`; if [[ $$MPATH == *NFINIDAT* ]] && [[ -f /sys/block/$$DEV/queue/scheduler ]]; then echo noop > /sys/block/$$DEV/queue/scheduler; fi'"

   

• 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 '/opt/infinidat/host-power-tools/src/infi/vendata/powertools/settings/cases/linux/base_cases/io_scheduler/scsi-io-scheduler.sh' $env{DEVPATH}"
  ACTION=="add|change", KERNEL=="dm-*", RUN+="/bin/bash '/opt/infinidat/host-power-tools/src/infi/vendata/powertools/settings/cases/linux/base_cases/io_scheduler/dm-io-scheduler.sh' $env{DEVPATH}"
  

To change the active I/O scheduler for sd devices, run 

echo noop > /sys/block/sdX/queue/scheduler

for every NIFNIDAT device.