lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20100125174723.GB28459@thunk.org>
Date:	Mon, 25 Jan 2010 12:47:23 -0500
From:	tytso@....edu
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	Anton Altaparmakov <aia21@....ac.uk>,
	Nick Piggin <npiggin@...e.de>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andreas Dilger <adilger@....com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>,
	linux-fsdevel@...r.kernel.org
Subject: Re: IO error semantics

On Mon, Jan 25, 2010 at 10:23:57AM -0500, Ric Wheeler wrote:
> 
> For permanent write errors, I would expect any modern drive to do a
> sector remapping internally. We should never need to track this kind
> of information for any modern device that I know of (S-ATA, SAS,
> SSD's and raid arrays should all handle this).

... and if the device is run out of all of its blocks in its spare
blocks pool, it's probably well past the time to replace said disk.

BTW, I really liked Dave Chinner's summary of the issues involved; I
ran into Kawai-san last week at Linux.conf.au, and we discussed pretty
much the same thing over lunch.  (i.e., that it's a hard problem, and
in some cases we need to retry the writes, such as a transient FC path
problem --- but some kind of write throttling is critical or we could
end up choking the VM due to too many pages getting dirtied and no way
of cleaning them.)

						- Ted
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ