On Wed, 21 Oct 2009, Zavodsky, Daniel (GE Capital) wrote:
Well, in my tests I have seen only a very slight improvement using the
NOOP IO scheduler on an enterprise storage array. Usually around 1-3%.
Isn't the 'noop' scheduler recommended for use -inside- the virtual
machines but not on the physical hosts -hosting- the virtual
machines themselves?
Vincent
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Domenico Viggiani
Sent: Tuesday, October 20, 2009 4:33 PM
To: 'Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list'
Subject: RE: [rhelv5-list] IO Scheduler and RAID HW or SAN
* F M wrote:
Fo years I left the default setting of our HDs IO scheduler. After
reading some articles about HW RAID and SAN it seems to me that it is
not a good thing to let Linux doing IO scheduling because the HW
between him and the HDs have his own IO scheduler.
I will probably run iozone to test with default and NOOP for example
but I am curious if someone has some toughts on that subject ?
I know that usage of NOOP scheduler is sometime recommended for virtual
machine hosting:
http://kbase.redhat.com/faq/docs/DOC-5428
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