From: Mark Lord <liml@rtr.ca>
To: Ric Wheeler <rwheeler@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Christoph Hellwig <hch@infradead.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Mackerras <paulus@samba.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
xfs@oss.sgi.com, linux-fsdevel@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
jens.axboe@oracle.com,
IDE/ATA development list <linux-ide@vger.kernel.org>,
Neil Brown <neilb@suse.de>
Subject: Re: [PATCH, RFC] xfs: batched discard support
Date: Thu, 20 Aug 2009 10:38:19 -0400 [thread overview]
Message-ID: <4A8D5FDB.7080505@rtr.ca> (raw)
In-Reply-To: <4A8D5442.1000302@redhat.com>
Ric Wheeler wrote:
>
> Note that returning consistent data is critical for devices that are
> used in a RAID group since you will need each RAID block that is used to
> compute the parity to continue to return the same data until you
> overwrite it with new data :-)
>
> If we have a device that does not support this (or is misconfigured not
> to do this), we should not use those devices in an MD group & do discard
> against it...
..
Well, that's a bit drastic. But the RAID software should at least
not issue TRIM commands in ignorance of such.
Would it still be okay to do the TRIMs when the entire parity stripe
(across all members) is being discarded? (As opposed to just partial
data there being dropped)
next prev parent reply other threads:[~2009-08-20 14:38 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-16 0:47 [PATCH, RFC] xfs: batched discard support Christoph Hellwig
2009-08-16 1:35 ` Mark Lord
2009-08-16 2:19 ` Mark Lord
2009-08-16 2:25 ` Christoph Hellwig
2009-08-16 2:49 ` Mark Lord
2009-08-16 3:25 ` Mark Lord
2009-08-16 13:00 ` Mark Lord
2009-08-16 13:53 ` Christoph Hellwig
2009-08-16 13:59 ` Mark Lord
2009-08-16 14:06 ` Mark Lord
2009-08-16 14:23 ` Christoph Hellwig
2009-08-16 14:26 ` Mark Lord
2009-08-19 20:39 ` Ingo Molnar
2009-08-20 1:05 ` Christoph Hellwig
2009-08-20 1:10 ` Jamie Lokier
2009-08-20 1:38 ` Douglas Gilbert
2009-08-20 1:38 ` Mark Lord
2009-08-21 12:46 ` Ingo Molnar
2009-08-20 1:39 ` Mark Lord
2009-08-20 13:48 ` Ric Wheeler
2009-08-20 14:38 ` Mark Lord [this message]
2009-08-20 14:42 ` Ric Wheeler
2009-08-20 17:19 ` Greg Freemyer
2009-08-20 14:42 ` James Bottomley
2009-08-20 15:43 ` Rolf Eike Beer
2009-08-20 17:00 ` Ric Wheeler
2009-08-20 14:58 ` Douglas Gilbert
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