RHEL Kernel Performance Optimization, Characterization ... - Red Hat
RHEL Kernel Performance Optimization, Characterization ... - Red Hat
RHEL Kernel Performance Optimization, Characterization ... - Red Hat
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Disk IO tuning <strong>RHEL</strong>4/5<strong>RHEL</strong>4/5 – 4 tunable I/O Schedulers●●●●CFQ – elevator=cfq. Completely Fair Queuing default, balanced, fair formultiple luns, adaptors, smp serversNOOP – elevator=noop. Nooperation in kernel, simple, low cpuoverhead, leave opt to ramdisk, raid cntrl etc.Deadline – elevator=deadline. Optimize for runtimelike behavior, lowlatency per IO, balance issues with large IO luns/controllers (NOTE:current best for FC5)Anticipatory – elevator=as. Inserts delays to help stack aggregate IO,best on system w/ limited physical IO – SATA<strong>RHEL</strong>4 Set at boot time on command line<strong>RHEL</strong>5 – Change on the fly
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