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Re: [dm-devel] performance considerations with IO schedulers and DM multipathing

Hi Paul,

the device-mapper target itself doe not use any queue and so there is no scheduler used at all. Only the real devices that are used as paths will be using a scheduler. Whether there might be a performance gain by changing these, I do not know.


2007/11/27, Paul Cote <paul cote incipient com>:
Is there any advantage to one specific IO scheduler (below) that may improve IO performance / throughput when running with a round-robin failover policy? Has anyone done testing with this ... and willing to share results?
  • Completely Fair Queuing—elevator=cfq (default)
  • Deadline—elevator=deadline
  • NOOP—elevator=noop
  • Anticipatory—elevator=as

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