How to increase the I/O priority of processes
In Linux, you can increase or decrease I/O access priority per process with ionice, which displays and changes the I/O scheduling class and priority of a process…
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Linux Tuning.
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Suggested I/O scheduler for a Video on Demand (VOD) server using Red Hat Enterprise Linux
On a VOD server, using the cfg scheduler can increase disk I/O latency when many connections arrive, leading to uneven video playback.