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Re: [rhelv5-list] I/O load and block device schedulers



On Fri, Sep 23, 2011 at 9:09 AM, Chris Adams <cmadams hiwaay net> wrote:
> The primary storage is on an iSCSI SAN (Dell EqualLogic PS6000X), so I
> was also wondering what might happen if I set the OS scheduler to "noop"
> and let the SAN do all the scheduling (under the assumption that since
> it knows the actual hardware layout, it could do a better job).  Has
> anybody tried that?

Hi Chris,

We have a bunch of PS6500E in two pools and while it wasn't a
scientific test, SANHQ does show greater peak iops for the same
workload with noop vs. default (CFQ?)  RHEL 5.6 and 6.1.

-Eugene


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