From: Roman Mamedov <rm@romanrm.ru>
To: hansbkk@gmail.com
Cc: Bryan Wintermute <bryanwintermute@gmail.com>, linux-raid@vger.kernel.org
Subject: Re: RAID 5 - One drive dropped while replacing another
Date: Wed, 2 Feb 2011 19:28:35 +0500 [thread overview]
Message-ID: <20110202192835.5d35f2d1@natsu> (raw)
In-Reply-To: <AANLkTimJC_e8=BmGj7Th_LLc=wnoNj8tRovAgTR=mmQ7@mail.gmail.com>
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On Wed, 2 Feb 2011 21:21:20 +0700
hansbkk@gmail.com wrote:
> On Wed, Feb 2, 2011 at 6:36 AM, Roman Mamedov <rm@romanrm.ru> wrote:
> >
> >> I have a RAID5 setup with 15 drives.
> >
> > Looks like you got the problem you were so desperately asking for, with
> > this crazy setup. :(
>
> Please give some more details as to what's so crazy about this.
>
> I would think RAID6 would have made more sense, possibly with an
> additional spare if these are large drives (over a few hundred GB?)
Exactly, RAID6 would make an order of magnitude more sense.
A 15-drive RAID5 array is just one step (one drive failure) from becoming a
14-drive RAID0 array (reliability-wise).
Would you also ask "what's wrong with having a 14-drive RAID0"?
See the link below for some array failure probability calculations:
http://louwrentius.com/blog/2010/08/raid-5-vs-raid-6-or-do-you-care-about-your-data/
--
With respect,
Roman
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next prev parent reply other threads:[~2011-02-02 14:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTinXTYds442gPrs9a9vKtWTo4OcDHDEzvO0njvyv@mail.gmail.com>
2011-02-01 23:27 ` RAID 5 - One drive dropped while replacing another Bryan Wintermute
2011-02-01 23:36 ` Roman Mamedov
2011-02-02 6:20 ` Leslie Rhorer
2011-02-02 14:21 ` hansbkk
2011-02-02 14:28 ` Roman Mamedov [this message]
2011-02-02 15:28 ` hansbkk
[not found] ` <AANLkTikm5unULgkUBM__d8N9XPReu9BtjijAHt9zzvaP@mail.gmail.com>
2011-02-02 16:29 ` hansbkk
2011-02-02 21:15 ` David Brown
2011-02-02 17:25 ` Leslie Rhorer
2011-02-02 17:51 ` hansbkk
2011-02-02 20:56 ` Leslie Rhorer
2011-02-02 14:29 ` Mathias Burén
2011-02-02 14:47 ` Robin Hill
2011-02-02 16:24 ` David Brown
2011-02-02 16:48 ` hansbkk
2011-02-02 21:22 ` David Brown
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