linux-kernel - Re: [patch] ext2/3: document conditions when reliable operation is possible

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Message-ID: <20090825135700.GA1552296@hiwaay.net>
Date:	Tue, 25 Aug 2009 08:57:00 -0500
From:	Chris Adams <cmadams@...aay.net>
To:	linux-kernel@...r.kernel.org
Subject: Re: [patch] ext2/3: document conditions when reliable operation is possible

Once upon a time, Theodore Tso  <tytso@....edu> said:
>I'll note, BTW, that AIX uses a journal to protect against these sorts
>of problems with software raid; this also means that with AIX, you
>also don't have to rebuild a RAID 1 device after an unclean shutdown,
>like you have do with Linux MD.  This was on the EVMS's team
>development list to implement for Linux, but it got canned after LVM
>won out, lo those many years ago.

See mdadm(8) and look for "--bitmap".  It has a few issues (can't
reshape an array with a bitmap for example; you have to remove the
bitmap, reshape, and re-add the bitmap), but it is available.
-- 
Chris Adams <cmadams@...aay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
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