From: tsuraan <tsuraan@gmail.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: RAID[56] status
Date: Tue, 10 Nov 2009 15:06:41 -0600 [thread overview]
Message-ID: <84fb38e30911101306p30633135tdbec8c282692b3f4@mail.gmail.com> (raw)
In-Reply-To: <e9c3a7c20911101151q2d85237cyecdd7d292d21552d@mail.gmail.com>
> 3/ The md-raid6 recovery code assumes that there is always at least
> two good blocks to perform recovery. That makes the current minimum
> number of raid6 members 4, not 3. (small nit the btrfs code calls
> members 'stripes', in md a stripe of data is a collection of blocks
> from all members).
Why would you use RAID6 on three drives instead of mirroring across
all of them? I agree it's an artificial limitation, but would anybody
use a RAID6 with fewer than 4 drives?
next prev parent reply other threads:[~2009-11-10 21:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-06 10:17 RAID[56] status David Woodhouse
2009-08-07 9:43 ` Roy Sigurd Karlsbakk
2009-08-07 15:22 ` David Woodhouse
2009-09-02 16:32 ` [PATCH] don't OOPs when we are not raid56 jim owens
2009-09-08 9:15 ` David Woodhouse
2009-09-08 13:48 ` Chris Mason
2009-11-10 19:51 ` RAID[56] status Dan Williams
2009-11-10 20:05 ` Tomasz Torcz
2009-11-10 20:11 ` Chris Mason
2009-11-10 21:06 ` tsuraan [this message]
2009-11-10 21:20 ` Gregory Maxwell
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