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!! Which one should I use?
I've not personally done any testing on this, so I can't speak from experience yet. The anticipatory scheduler will be the default one for a reason however - it is optimised for the common case. If you've only got single disk systems (ie, no RAID - hardware or software) then this scheduler is probably the right one for you. If it's a multiuser system, you will probably find CFQ or deadline providing better performance, and the numbers seem to back deadline giving the best performance for database systems.
!! Tuning the I/O schedulers
The schedulers may have parameters that can be tuned at runtime. Read the LinuxKernel documentation on the schedulers listed in the ''References'' section below