From: Bill Davidsen <davidsen@tmr.com>
To: "Callahan, Tom" <CallahanT@tessco.com>
Cc: 'Andargor The Wise' <andargor@yahoo.com>, linux-raid@vger.kernel.org
Subject: Re: First RAID Setup
Date: Thu, 22 Dec 2005 09:00:46 -0500 [thread overview]
Message-ID: <43AAB18E.70009@tmr.com> (raw)
In-Reply-To: <0481A62A3E95A044AC20A1A45899645C06B02F4A@glc-mail-1.tessco.com>
Callahan, Tom wrote:
>You "should" have a designated spare for RAID-5.
>
>Not sure why you have 3 disks for each RAID1, RAID1 is mirror, and unless
>the third drive is a spare, it is not needed.
>
>Thanks,
>Tom Callahan
>
>
Why would you have a hot spare? In RAID-1 if one drive failed you would
copy the full set of data to the "spare" so you know what to copy,
another mirror can help your read performance under heavy load. You get
the same protection as a hot spare, it's online if you need it, it
covers the case where two drives fail... what's not to like? ;-)
If a third drive is justified, I see no reason to keep it as a spare
rather than a live mirror in RAID-1.
--
bill davidsen <davidsen@tmr.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
next prev parent reply other threads:[~2005-12-22 14:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-15 19:35 First RAID Setup Callahan, Tom
2005-12-15 19:44 ` Andargor The Wise
2005-12-22 14:00 ` Bill Davidsen [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-12-22 17:03 Andrew Burgess
2005-12-15 21:46 Callahan, Tom
2005-12-15 20:37 Callahan, Tom
2005-12-17 0:00 ` Andargor The Wise
2005-12-17 2:01 ` Andargor The Wise
2005-12-18 22:08 ` Andargor The Wise
2005-12-22 14:27 ` Bill Davidsen
2005-12-22 15:00 ` Andargor The Wise
2005-12-15 20:02 Callahan, Tom
2005-12-15 20:22 ` Andargor The Wise
2005-12-15 20:46 ` Brad Campbell
2005-12-15 21:31 ` Tobias Hofmann
2005-12-16 1:51 ` Max Waterman
2005-12-16 8:01 ` Tobias Hofmann
2005-12-16 1:53 ` Neil Brown
2005-12-16 8:08 ` Tobias Hofmann
2005-12-19 1:02 ` Neil Brown
2005-12-19 9:03 ` Max Waterman
2005-12-16 8:42 ` Gordon Henderson
2005-12-22 14:20 ` Bill Davidsen
2005-12-22 14:24 ` Mattias Wadenstein
2005-12-15 19:09 Andargor The Wise
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