Tuning the I/O scheduler
Using the correct I/O scheduler can increase performance and reduce the possibility of database timeouts when the system is under extreme write load.
About this task
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The procedure for configuring a scheduler to use at startup depends on the version of Linux. See the Linux documentation for your specific version for the correct way to configure this setting.
Steps
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To determine which scheduler is configured on your system, run the following command.
$ cat /sys/block/<block-device>/queue/scheduler -
To change the scheduler on a running system, run the following command.
$ echo 'deadline' > /sys/block/sda/queue/scheduler -
To apply the change, restart the system.