From: Chris Mason <chris.mason@oracle.com>
To: Avi Kivity <avi@redhat.com>
Cc: Ric Wheeler <rwheeler@redhat.com>,
Stephan von Krawczynski <skraw@ithnet.com>,
Christoph Hellwig <hch@infradead.org>, jim owens <jowens@hp.com>,
linux-btrfs@vger.kernel.org
Subject: Re: Some very basic questions
Date: Wed, 22 Oct 2008 10:36:55 -0400 [thread overview]
Message-ID: <1224686215.6448.49.camel@think.oraclecorp.com> (raw)
In-Reply-To: <48FF396B.1020700@redhat.com>
On Wed, 2008-10-22 at 16:32 +0200, Avi Kivity wrote:
> Ric Wheeler wrote:
> > One key is not to replace the drives too early - you often can recover
> > significant amounts of data from a drive that is on its last legs.
> > This can be useful even in RAID rebuilds since with today's enormous
> > drive capacities, you might hit a latent error during the rebuild on
> > one of the presumed healthy drives.
> >
> > Of course, if you don't have a spare drive in your configuration, this
> > is not practical...
>
> Why would you have a spare drive? That's a wasted spindle.
>
> You want to have spare capacity, enough for one or two (or fifteen)
> drives' worth of data. When a drive goes bad, you rebuild into the
> spare capacity you have.
>
You want spare capacity that does not degrade your raid levels if you
move the data onto it. In some configs, this will be a hot spare, in
others it'll just be free space.
-chris
next prev parent reply other threads:[~2008-10-22 14:36 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-21 11:23 Some very basic questions Stephan von Krawczynski
2008-10-21 12:13 ` Andi Kleen
2008-10-21 14:22 ` Stephan von Krawczynski
2008-10-21 15:34 ` jim owens
2008-10-22 11:36 ` Stephan von Krawczynski
2008-10-22 12:15 ` Avi Kivity
2008-10-22 13:03 ` Ric Wheeler
2008-10-22 13:13 ` Chris Mason
2008-10-22 13:16 ` Avi Kivity
2008-10-21 13:20 ` jim owens
2008-10-21 17:01 ` Stephan von Krawczynski
2008-10-21 17:15 ` Christoph Hellwig
2008-10-21 17:31 ` Ric Wheeler
2008-10-22 12:27 ` Stephan von Krawczynski
2008-10-22 13:15 ` Chris Mason
2008-10-22 13:27 ` Ric Wheeler
2008-10-22 14:32 ` Avi Kivity
2008-10-22 14:36 ` Chris Mason [this message]
2008-10-22 14:40 ` Avi Kivity
2008-10-22 14:46 ` Ric Wheeler
2008-10-22 14:54 ` Avi Kivity
2008-10-22 15:02 ` Ric Wheeler
2008-10-22 15:13 ` Avi Kivity
2008-10-22 15:25 ` Ric Wheeler
2008-10-22 15:33 ` Chris Mason
2008-10-22 15:43 ` Avi Kivity
2008-10-22 15:54 ` Ric Wheeler
2008-10-22 18:28 ` Avi Kivity
2008-10-22 15:39 ` Avi Kivity
2008-10-22 13:52 ` Stephan von Krawczynski
2008-10-22 15:56 ` Michel Salim
2008-10-22 16:56 ` jim owens
2008-10-23 9:47 ` Stephan von Krawczynski
2008-10-22 11:40 ` Stephan von Krawczynski
2008-10-21 13:59 ` Chris Mason
2008-10-21 16:09 ` Andi Kleen
2008-10-22 11:43 ` Stephan von Krawczynski
2008-10-21 16:27 ` Stephan von Krawczynski
2008-10-21 16:59 ` Andi Kleen
2008-10-22 11:46 ` Stephan von Krawczynski
2008-10-21 17:49 ` Chris Mason
2008-10-22 12:19 ` Stephan von Krawczynski
2008-10-22 12:48 ` Jeff Schroeder
2008-10-22 14:02 ` Stephan von Krawczynski
2008-10-22 13:50 ` Chris Mason
2008-10-22 14:04 ` Matthias Wächter
2008-10-22 14:32 ` Ric Wheeler
2008-10-22 14:44 ` jim owens
2008-10-24 8:42 ` Chris Samuel
2008-10-24 8:39 ` Chris Samuel
2008-10-21 20:54 ` Eric Anopolsky
2008-10-21 22:18 ` Ric Wheeler
2008-10-22 2:29 ` Eric Anopolsky
2008-10-22 10:42 ` Ric Wheeler
2008-10-22 10:53 ` Tejun Heo
2008-10-22 12:57 ` Ric Wheeler
2008-10-22 12:57 ` Ric Wheeler
2008-10-22 13:15 ` Tejun Heo
2008-10-22 13:19 ` Chris Mason
2008-10-22 13:38 ` Ric Wheeler
2008-10-22 13:59 ` Chris Mason
2008-10-22 14:23 ` Ric Wheeler
2008-10-22 13:23 ` Ric Wheeler
2008-10-22 16:14 ` Tejun Heo
2008-10-22 16:34 ` Ric Wheeler
2008-10-23 3:59 ` Tejun Heo
2008-10-22 18:32 ` Avi Kivity
2008-10-22 19:13 ` jim owens
2008-10-22 19:22 ` Avi Kivity
2008-10-22 19:59 ` Ric Wheeler
2008-10-22 21:31 ` Eric Anopolsky
2008-10-22 21:56 ` Ric Wheeler
-- strict thread matches above, loose matches on Subject: below --
2008-10-21 17:37 calin
2008-10-21 20:08 ` jim owens
2008-10-22 7:15 ` Avi Kivity
2008-10-22 14:13 ` jim owens
2008-10-22 14:25 ` Avi Kivity
2008-10-22 14:35 dbz
2008-10-27 15:43 ` Stephan von Krawczynski
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