linux-kernel - Re: How to handle >16TB devices on 32 bit hosts ??

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Message-ID: <20090729150716.GG1534@ucw.cz>
Date:	Wed, 29 Jul 2009 17:07:16 +0200
From:	Pavel Machek <pavel@....cz>
To:	Theodore Tso <tytso@....edu>, Andi Kleen <andi@...stfloor.org>,
	Andreas Dilger <adilger@....com>,
	device-mapper development <dm-devel@...hat.com>,
	Neil Brown <neilb@...e.de>, linux-fsdevel@...r.kernel.org,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: How to handle >16TB devices on 32 bit hosts ??

Hi!

> > > Also, for filesystems like btrfs or ZFS the checking can be done
> > > online and incrementally without storing a full representation of
> > > the state in memory.
> > 
> > You could, but I suspect it would be cheaper to just use a
> > 64bit system than to rewrite fsck. 64bit is available
> > for a lot of embedded setups these days too.
> 
> We don't have to rewrite fsck; most of the framework for supporting an
> run-length-conding for compressed bitmaps is already in patches that
> add > 32-bit block numbers to e2fsprogs; we've just been more focused
> on getting 64-bit block numbers support merged than implementing
> compressed bitmaps, but it's only one file that would need to be
> added, and we might be able to steal the compressed bitmap support
> from xfsprogs --- which does this already.

Well... 'If allocation pattern is bad your fsck runs out of address
space and breaks on your 15T fs' would scare me.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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