From: Timothy Miller <miller@techsource.com>
To: Mike Fedyk <mfedyk@matchmail.com>
Cc: Nick Piggin <piggin@cyberone.com.au>,
Kyle Wong <kylewong@southa.com>,
linux-kernel@vger.kernel.org
Subject: Re: questions about io scheduler
Date: Fri, 05 Mar 2004 18:49:49 -0500 [thread overview]
Message-ID: <4049121D.1060405@techsource.com> (raw)
In-Reply-To: <404905E1.70709@matchmail.com>
Mike Fedyk wrote:
> Nick Piggin wrote:
>
>>
>>
>> Kyle Wong wrote:
>>
>>> 2. Does io scheduler works with md RAID? Correct me if I'm wrong,
>>> io-schedular <--> md driver <--> harddisks.
>>>
>>>
>>
>> It goes md driver -> io schedulers -> hard disks.
>
>
> There is an IO scheduler per disk.
>
> So MD submits the data to each disk through the IO scheduler.
>
> This allows you to have the heads on each disk in the array at different
> locations, and helps keep response times lower for seeky loads.
Say you've got a RAID1. In this case, MD could send the read request to
either device. How does it decide which one to use?
next prev parent reply other threads:[~2004-03-05 23:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-05 9:22 questions about io scheduler Kyle Wong
2004-03-05 9:20 ` Nick Piggin
2004-03-05 22:57 ` Mike Fedyk
2004-03-05 23:49 ` Timothy Miller [this message]
2004-03-05 23:58 ` Mike Fedyk
2004-03-05 9:20 ` Jens Axboe
[not found] <1wjF1-2yG-19@gated-at.bofh.it>
[not found] ` <1wk7X-31w-1@gated-at.bofh.it>
[not found] ` <1wwCd-Pi-5@gated-at.bofh.it>
[not found] ` <1wx5r-1qI-9@gated-at.bofh.it>
[not found] ` <1wxyd-1WX-1@gated-at.bofh.it>
2004-03-09 20:22 ` Bill Davidsen
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