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=== SSD disks or rotational disks but with hardware raid card that has cache enabled ===
 
=== SSD disks or rotational disks but with hardware raid card that has cache enabled ===
  
''Block multiqueue'' enabled (and thus no I/O scheduler at all) or block multiqueue disabled and ''noop'' or ''deadline'' I/O scheduler activated is good solution. SSD disks don't really need I/O schedulers while smart raid cards do I/O ordering on their own.
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Block multiqueue enabled (and thus no I/O scheduler at all) or block multiqueue disabled and noop or deadline I/O scheduler activated is good solution. SSD disks don't really need I/O schedulers while smart raid cards do I/O ordering on their own.
  
 
Note that if your raid is very dumb and/or has no cache enabled then it likely cannot reorder I/O requests and thus it could benefit from I/O scheduler.
 
Note that if your raid is very dumb and/or has no cache enabled then it likely cannot reorder I/O requests and thus it could benefit from I/O scheduler.

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