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RE: [dm-devel] performance considerations with IO schedulers and DMmultipathing

Here's some links:

Google cache of this article:
"The basis for my test was to determine the best possible performance combination of elevator tuning AND /etc/multipath.conf rr_min_io setting."

"The short summary of our study indicates that there is no SINGLE answer to which I/O scheduler is best."

Oracle and linux I/O Scheduler
part 1- http://www.nextre.it/oracledocs/ioscheduler_01.html
part 2- http://www.nextre.it/oracledocs/ioscheduler_02.html
part 3- http://www.nextre.it/oracledocs/ioscheduler_03.html

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-----Original Message-----

From: dm-devel-bounces redhat com on behalf of Stefan Bader
Sent: Tue 11/27/2007 4:42 PM
To: device-mapper development
Subject: Re: [dm-devel] performance considerations with IO schedulers and DMmultipathing
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>:
>  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
> --
> dm-devel mailing list
> dm-devel redhat com
> https://www.redhat.com/mailman/listinfo/dm-devel

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