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

[Stefan Bader]

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.

Stefan

2007/11/27, Paul Cote <paul.cote at incipient.com>:
>
>  Hi,
>
> 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?
>
> thanks,
> Paul
>
> Completely Fair Queuing—elevator=cfq (default)
> Deadline—elevator=deadline
> NOOP—elevator=noop
> Anticipatory—elevator=as
>
>
>
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>
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