linux-kernel - Re: ZFS with Linux: An Open Plea

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Message-ID: <46252891.6080701@wizy.org>
Date:	Tue, 17 Apr 2007 21:05:37 +0100
From:	Ricardo Correia <linux-kernel@...y.org>
To:	Florian Weimer <fw@...eb.enyo.de>
CC:	Theodore Tso <tytso@....edu>,
	Daniel Hazelton <dhazelton@...er.net>,
	Tomasz K?oczko <kloczek@...y.mif.pg.gda.pl>,
	"David R. Litwin" <presently42@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: ZFS with Linux: An Open Plea

Ricardo Correia wrote:
> That FAQ entry is outdated, ZFS can recover from metadata corruption on
> non-replicated pools for a long time already.

Just a clarification, ZFS not only detects metadata corruption through
the use of checksums but, since it keeps 2-3 copies of each metadata
block on-disk (even on non-replicated pools), it also rewrites the
corrupted blocks, effectively repairing the corruption.

All of this is done transparently to the user but, of course, it's
possible to see a report of checksum failures.

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