From: "J. Ryan Earl" <ryan@dynaconnections.com>
To: David Dougall <davidd@et.byu.edu>
Cc: linux-raid@vger.kernel.org
Subject: Re: Problems with software RAID + iSCSI or GNBD
Date: Thu, 30 Jun 2005 13:05:05 -0500 [thread overview]
Message-ID: <42C43451.5030904@dynaconnections.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0506290918380.799@lewis.et.byu.edu>
David Dougall wrote:
>reads from a Raid1 md device will always round-robin between
>the devices to increase performance.
>
If it was round-robin that would actually decrease the performance, it's
locality based. It reads from the RAID member that last operated in the
physical vicinity of the requested data to be read. ie it minimize the
distance disk heads have to move. This is one way RAID1 lowers average
seek time.
-ryan
prev parent reply other threads:[~2005-06-30 18:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-27 2:42 Problems with software RAID + iSCSI or GNBD Christopher Smith
2005-06-28 16:05 ` Michael Stumpf
2005-06-29 2:09 ` Christopher Smith
2005-06-29 1:11 ` Paul Clements
2005-06-29 4:42 ` Christopher Smith
2005-06-29 14:40 ` Bill Davidsen
2005-06-29 15:24 ` David Dougall
2005-06-29 15:59 ` Bill Davidsen
2005-06-30 18:05 ` J. Ryan Earl [this message]
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