From: Andreas Dilger <adilger@clusterfs.com>
To: John Bradford <john@grabjohn.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: More intellegent bad block reallocation in software?
Date: Mon, 2 Dec 2002 16:14:16 -0700 [thread overview]
Message-ID: <20021202161416.L1422@schatzie.adilger.int> (raw)
In-Reply-To: <200212022320.gB2NKS2J000315@darkstar.example.net>; from john@grabjohn.com on Mon, Dec 02, 2002 at 11:20:28PM +0000
On Dec 02, 2002 23:20 +0000, John Bradford wrote:
> My idea is that we could allocate one block out of every ten to be a
> spare block, (which would reduce disk capacity by 10%), and then if a
> block needed to be re-allocated, we could allocate one from the same
> cylinder, therefore removing the need for the heads to seek across the
> disk.
>
> How easily could this be added to existing filesystems? Presumably
> we'd need extra functionality in both filesystem code and the IDE and
> SCSI code, and I realise that it might be completely impossible,
> without custom firmware on the disk. It's an interesting idea
> though.
Even better - just ignore bad blocks and don't relocate them at all.
That's what ext2/3 do - just skip those blocks and avoid the seek
entirely.
Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/
next prev parent reply other threads:[~2002-12-02 23:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-02 23:20 John Bradford
2002-12-02 23:14 ` Andreas Dilger [this message]
2002-12-02 23:30 Manish Lachwani
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