From: Neil Brown <neilb@suse.de>
To: Janek Kozicki <janek_listy@wp.pl>
Cc: linux-raid@vger.kernel.org
Subject: Re: very degraded RAID5, or increasing capacity by adding discs
Date: Tue, 9 Oct 2007 13:32:09 +1000 [thread overview]
Message-ID: <18186.63033.185101.385806@notabene.brown> (raw)
In-Reply-To: message from Janek Kozicki on Tuesday October 9
On Tuesday October 9, janek_listy@wp.pl wrote:
>
> Problems at step 4.: 'man mdadm' doesn't tell if it's possible to
> grow an array to a degraded array (non existant disc). Is it possible?
Why not experiment with loop devices on files and find out?
But yes: you can grow to a degraded array providing you specify a
--backup-file.
However I don't recommend it. I would never recommend having a
degraded array by design. It should only ever happen due to a
failure, and should last only until you can get a replacement
rebuilt.
Remember that a degraded raid5 has a greater risk of data loss than a
single drive.
>
>
> PS: the fact, that degraded array will be unsafe for the data is an
> intented motivating factor for buying next drive ;)
:-)
NeilBrown
next prev parent reply other threads:[~2007-10-09 3:32 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-08 19:13 very degraded RAID5, or increasing capacity by adding discs Janek Kozicki
2007-10-08 19:17 ` Justin Piszcz
2007-10-08 19:26 ` Richard Scobie
2007-10-08 20:08 ` Guy Watkins
2007-10-08 22:25 ` Janek Kozicki
2007-10-08 22:46 ` Janek Kozicki
2007-10-09 1:53 ` Guy Watkins
2007-10-09 3:32 ` Neil Brown [this message]
2007-10-09 14:44 ` Janek Kozicki
2007-10-09 14:56 ` Mr. James W. Laferriere
2007-10-09 21:52 ` Neil Brown
2007-10-08 22:52 ` Michael Tokarev
2007-10-09 3:24 ` Neil Brown
2007-10-09 9:48 ` Michael Tokarev
2007-10-22 9:03 ` Louis-David Mitterrand
2007-10-23 22:41 ` Bill Davidsen
2007-10-09 14:42 ` Janek Kozicki
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