From: jim owens <jowens@hp.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: linux-fsdevel@vger.kernel.org, Matthew Wilcox <matthew@wil.cx>,
Theodore Tso <tytso@mit.edu>, Ric Wheeler <rwheeler@redhat.com>,
Jens Axboe <jens.axboe@oracle.com>,
Chris Mason <chris.mason@oracle.com>,
Dave Chinner <david@fromorbit.com>,
David Woodhouse <dwmw2@infradead.org>,
linux-scsi@vger.kernel.org, Black_David@emc.com,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Tom Coughlan <coughlan@redhat.com>,
Eyal Shani <Eyal.Shani@sandisk.com>
Subject: Re: thin provisioned LUN support & file system allocation policy
Date: Fri, 07 Nov 2008 11:23:08 -0500 [thread overview]
Message-ID: <49146B6C.3070307@hp.com> (raw)
In-Reply-To: <1226074335.8030.40.camel@localhost.localdomain>
James Bottomley wrote:
> On Fri, 2008-11-07 at 11:07 -0500, jim owens wrote:
>> We have become confused and combined 2 independent issues...
>>
>> UNMAP thin storage array provisioning is not SSD TRIM.
>
> Actually, currently they are.
Sorry, I'm not being clear. It may be the same code but
the "what is the design goal" is different.
The goal for SSD is to handle devices that are reasonably
small in size and have (we hope) reasonably small trim
chunk sizes.
The key here the size of the SSD device would keep any
merge bitmap you did in the block layer reasonable.
A 512-byte-per-block merge map for a 1,000 TB san array
is much uglier.
I'm saying that ugliness belongs to the array vendor.
Keep a common linux block layer discard/trim/unmap
that is good for reasonable devices - screw the rest!
jim
next prev parent reply other threads:[~2008-11-07 16:23 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-06 14:43 thin provisioned LUN support Ric Wheeler
2008-11-06 15:17 ` James Bottomley
2008-11-06 15:24 ` David Woodhouse
2008-11-06 16:00 ` Ric Wheeler
2008-11-06 16:40 ` Martin K. Petersen
2008-11-06 17:04 ` Ric Wheeler
2008-11-06 17:15 ` Matthew Wilcox
2008-11-07 12:05 ` Jens Axboe
2008-11-07 12:14 ` Ric Wheeler
2008-11-07 12:17 ` David Woodhouse
2008-11-07 12:19 ` Jens Axboe
2008-11-07 14:26 ` thin provisioned LUN support & file system allocation policy Ric Wheeler
2008-11-07 14:34 ` Matthew Wilcox
2008-11-07 14:45 ` Jörn Engel
2008-11-07 14:43 ` Theodore Tso
2008-11-07 14:54 ` Ric Wheeler
2008-11-07 15:26 ` jim owens
2008-11-07 15:31 ` David Woodhouse
2008-11-07 15:35 ` jim owens
2008-11-07 15:46 ` Theodore Tso
2008-11-07 15:51 ` Martin K. Petersen
2008-11-07 16:06 ` Ric Wheeler
2008-11-07 15:56 ` James Bottomley
2008-11-07 15:36 ` James Bottomley
2008-11-07 15:48 ` David Woodhouse
2008-11-07 15:36 ` Theodore Tso
2008-11-07 15:45 ` Matthew Wilcox
2008-11-07 16:07 ` jim owens
2008-11-07 16:12 ` James Bottomley
2008-11-07 16:23 ` jim owens [this message]
2008-11-07 16:02 ` Ric Wheeler
2008-11-07 14:55 ` Matthew Wilcox
2008-11-07 15:20 ` thin provisioned LUN support James Bottomley
2008-11-09 23:08 ` Dave Chinner
2008-11-09 23:37 ` James Bottomley
2008-11-10 0:33 ` Dave Chinner
2008-11-10 14:31 ` James Bottomley
2008-11-07 15:49 ` Chris Mason
2008-11-07 16:00 ` Martin K. Petersen
2008-11-07 16:06 ` James Bottomley
2008-11-07 16:11 ` Chris Mason
2008-11-07 16:18 ` James Bottomley
2008-11-07 16:22 ` Ric Wheeler
2008-11-07 16:27 ` James Bottomley
2008-11-07 16:28 ` David Woodhouse
2008-11-07 17:22 ` Chris Mason
2008-11-07 18:09 ` Ric Wheeler
2008-11-07 18:36 ` Theodore Tso
2008-11-07 18:41 ` Ric Wheeler
[not found] ` <49148BDF.9050707@redhat.com>
2008-11-07 19:35 ` Theodore Tso
2008-11-07 19:55 ` Martin K. Petersen
2008-11-07 20:19 ` Theodore Tso
2008-11-07 20:21 ` Matthew Wilcox
[not found] ` <20081107202149.GJ15439@parisc-linux.org>
2008-11-07 20:26 ` Ric Wheeler
2008-11-07 20:48 ` Chris Mason
2008-11-07 21:04 ` Ric Wheeler
2008-11-07 21:13 ` Theodore Tso
2008-11-07 20:42 ` Theodore Tso
2008-11-07 21:06 ` Martin K. Petersen
2008-11-07 20:37 ` Ric Wheeler
2008-11-10 2:44 ` Black_David
2008-11-10 2:36 ` Black_David
2008-11-07 19:44 ` jim owens
2008-11-07 19:48 ` Matthew Wilcox
2008-11-07 19:50 ` Ric Wheeler
2008-11-09 23:36 ` Dave Chinner
2008-11-10 3:40 ` Thin provisioning & arrays Black_David
2008-11-10 8:31 ` Dave Chinner
2008-11-10 9:59 ` David Woodhouse
2008-11-10 13:30 ` Matthew Wilcox
2008-11-10 13:36 ` Jens Axboe
2008-11-10 17:05 ` UNMAP is a hint Black_David
2008-11-10 17:30 ` Matthew Wilcox
2008-11-10 17:56 ` Ric Wheeler
2008-11-10 22:18 ` Thin provisioning & arrays Dave Chinner
2008-11-11 1:23 ` Black_David
2008-11-11 2:09 ` Keith Owens
2008-11-11 13:59 ` Ric Wheeler
2008-11-11 14:55 ` jim owens
2008-11-11 15:38 ` Ric Wheeler
2008-11-11 15:59 ` jim owens
2008-11-11 16:25 ` Ric Wheeler
2008-11-11 16:53 ` jim owens
2008-11-11 23:08 ` Dave Chinner
2008-11-11 23:52 ` jim owens
2008-11-11 22:49 ` Dave Chinner
2008-11-06 15:27 ` thin provisioned LUN support jim owens
2008-11-06 15:57 ` jim owens
2008-11-06 16:21 ` James Bottomley
[not found] ` <yq1d4h8nao5.fsf@sermon.lab.mkp.net>
2008-11-06 15:42 ` Ric Wheeler
2008-11-06 15:57 ` David Woodhouse
2008-11-06 22:36 ` Dave Chinner
2008-11-06 22:55 ` Ric Wheeler
[not found] ` <491375E9.7020707@redhat.com>
2008-11-06 23:06 ` James Bottomley
2008-11-06 23:10 ` Ric Wheeler
2008-11-06 23:26 ` James Bottomley
2008-11-06 23:32 ` thin provisioned LUN support - T10 activity Black_David
2008-11-07 11:59 ` thin provisioned LUN support Artem Bityutskiy
2008-11-10 20:39 ` Aggregating discard requests in the filesystem Matthew Wilcox
2008-11-10 20:44 ` Chris Mason
2008-11-11 0:12 ` Brad Boyer
2008-11-11 15:25 ` jim owens
2008-11-11 16:40 ` thin provisioned LUN support Christoph Hellwig
2008-11-11 17:07 ` jim owens
2008-11-11 17:33 ` Christoph Hellwig
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