From: Janek Kozicki <janek_listy@wp.pl>
Cc: linux-raid@vger.kernel.org
Subject: Re: RAID5 to RAID6 reshape?
Date: Mon, 18 Feb 2008 00:54:50 +0100 [thread overview]
Message-ID: <20080218005450.6b4bc0b3@szpak> (raw)
In-Reply-To: <Pine.LNX.4.64.0802171727250.27728@coffee.psychology.mcmaster.ca>
Mark Hahn said: (by the date of Sun, 17 Feb 2008 17:40:12 -0500 (EST))
> >> I'm also interested in hearing people's opinions about LVM / EVMS.
> >
> > With LVM it will be possible for you to have several raid5 and raid6:
> > eg: 5 HHDs (raid6), 5HDDs (raid6) and 4 HDDs (raid5). Here you would
> > have 14 HDDs and five of them being extra - for safety/redundancy
> > purposes.
>
> that's a very high price to pay.
>
> > partition on top of them. Without LVM you will end up with raid6 on
> > 14 HDDs thus having only 2 drives used for redundancy. Quite risky
> > IMHO.
>
> your risk model is quite strange - 5/14 redundancy means that either
yeah, sorry. I went too far.
I didn't have IO controller failure so far. But I've read about one
on this list, and that all data was lost.
You're right, better to duplicate a server with backup copy, so it is
independent of the original one.
--
Janek Kozicki |
next prev parent reply other threads:[~2008-02-17 23:54 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-17 3:58 RAID5 to RAID6 reshape? Beolach
2008-02-17 11:50 ` Peter Grandi
2008-02-17 14:45 ` Conway S. Smith
2008-02-18 5:26 ` Janek Kozicki
2008-02-18 12:38 ` Beolach
2008-02-18 14:42 ` Janek Kozicki
2008-02-19 19:41 ` LVM performance (was: Re: RAID5 to RAID6 reshape?) Oliver Martin
2008-02-19 19:52 ` Jon Nelson
2008-02-19 20:00 ` Iustin Pop
2008-02-19 23:19 ` LVM performance Peter Rabbitson
2008-02-20 12:19 ` LVM performance (was: Re: RAID5 to RAID6 reshape?) Peter Grandi
2008-02-22 13:41 ` LVM performance Oliver Martin
2008-03-07 8:14 ` Peter Grandi
2008-03-09 19:56 ` Oliver Martin
2008-03-09 21:13 ` Michael Guntsche
2008-03-09 23:27 ` Oliver Martin
2008-03-09 23:53 ` Michael Guntsche
2008-03-10 8:54 ` Oliver Martin
2008-03-10 21:04 ` Peter Grandi
2008-03-12 14:03 ` Michael Guntsche
2008-03-12 19:54 ` Peter Grandi
2008-03-12 20:11 ` Guntsche Michael
2008-03-10 0:32 ` Richard Scobie
2008-03-10 0:53 ` Michael Guntsche
2008-03-10 0:59 ` Richard Scobie
2008-03-10 1:21 ` Michael Guntsche
2008-02-18 19:05 ` RAID5 to RAID6 reshape? Peter Grandi
2008-02-20 6:39 ` Alexander Kühn
2008-02-22 8:13 ` Peter Grandi
2008-02-23 20:40 ` Nagilum
2008-02-25 0:10 ` Peter Grandi
2008-02-25 16:31 ` Nagilum
2008-02-17 13:31 ` Janek Kozicki
2008-02-17 16:18 ` Conway S. Smith
2008-02-18 3:48 ` Neil Brown
2008-02-17 22:40 ` Mark Hahn
2008-02-17 23:54 ` Janek Kozicki [this message]
2008-02-18 12:46 ` Andre Noll
2008-02-18 18:23 ` Mark Hahn
2008-02-17 14:06 ` Janek Kozicki
2008-02-17 23:54 ` cat
2008-02-18 3:43 ` Neil Brown
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