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From: Rogier Wolff <R.E.Wolff@BitWizard.nl>
To: Steven Haigh <netwiz@crc.id.au>
Cc: Rogier Wolff <R.E.Wolff@BitWizard.nl>, linux-raid@vger.kernel.org
Subject: Re: New raid level suggestion.
Date: Thu, 30 Dec 2010 10:42:30 +0100	[thread overview]
Message-ID: <20101230094230.GE2986@bitwizard.nl> (raw)
In-Reply-To: <4D1C470E.4080406@crc.id.au>

On Thu, Dec 30, 2010 at 07:47:10PM +1100, Steven Haigh wrote:
> Maybe I'm not quite understanding right, however you can easily do RAID6 
> with 4 drives. That will give you two redundant, effectively give you 
> RAID5 if I drive fails, and save buttloads of messing around...

Steven, My friend has a server where the drives take up to a third of
a second to respond. When asking for help, everybody pounced on us:
- NEVER use raid5 for a server doing small-file-io like a mailserver.
  (always use RAID10). 

So apparently RAID5 (and by extension RAID6) is not an option for some
systems.

I'm willing to tolerate the RAID4 situation during the time that it
takes me to replace the drive.

	Roger. 

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
**    Delftechpark 26 2628 XH  Delft, The Netherlands. KVK: 27239233    **
*-- BitWizard writes Linux device drivers for any device you may have! --*
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Does it sit on the couch all day? Is it unemployed? Please be specific! 
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  reply	other threads:[~2010-12-30  9:42 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-30  8:23 New raid level suggestion Rogier Wolff
2010-12-30  8:47 ` Steven Haigh
2010-12-30  9:42   ` Rogier Wolff [this message]
2010-12-30 10:39     ` Stan Hoeppner
2010-12-30 11:58       ` John Robinson
2010-12-30 13:11         ` Stan Hoeppner
2010-12-30 18:10           ` John Robinson
2010-12-31 10:23             ` Stan Hoeppner
2010-12-30 23:20           ` Why won't mdadm start several RAIDs that appear to be fine? Jim Schatzman
2010-12-31  1:08             ` Neil Brown
2010-12-31  3:38               ` Why won't mdadm start several RAIDs that appear to be fine? Info from "mdadm -A --verbose" Jim Schatzman
2010-12-31  3:51               ` Why won't mdadm start several RAIDs that appear to be fine? SOLVED! Jim Schatzman
2011-01-03  4:33     ` New raid level suggestion Leslie Rhorer
2011-01-04 15:29       ` Rogier Wolff
2010-12-30 10:01 ` Neil Brown
2010-12-30 14:24 ` Ryan Wagoner

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