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From: Mike Fedyk <mfedyk@matchmail.com>
To: Nick Piggin <piggin@cyberone.com.au>
Cc: Kyle Wong <kylewong@southa.com>, linux-kernel@vger.kernel.org
Subject: Re: questions about io scheduler
Date: Fri, 05 Mar 2004 14:57:37 -0800	[thread overview]
Message-ID: <404905E1.70709@matchmail.com> (raw)
In-Reply-To: <40484643.7070104@cyberone.com.au>

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.

  reply	other threads:[~2004-03-05 22:58 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 [this message]
2004-03-05 23:49     ` Timothy Miller
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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