Page created: 26 Jul 2021 |
Page updated: 14 Jan 2022
Use the correct I/O scheduler to increase performance and reduce the possibility of database timeouts when the system is under extreme write load.
For file systems running on an SSD or in a virtualized environment, use the
noop scheduler. On some systems, such as RHEL 8.1+, this is
none. For all other systems, use the
To determine which scheduler is configured on your system, run the following
$ cat /sys/block/<block-device>/queue/scheduler
To change the scheduler on a running system, run the following command.
$ echo '<scheduler name>' > /sys/block/<block-device>/queue/scheduler
In the following example, the system is updated to use the deadline scheduler.
$ echo 'deadline' > /sys/block/sda/queue/scheduler
To enable the change, restart the system.
The procedure for configuring a scheduler to use at startup depends on the version of Linux. For the correct way to configure this setting, see the system documentation.