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From: Jamie Lokier <jamie@shareable.org>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 0 of 3] [RFC] I/O Hints
Date: Fri, 6 Jun 2008 15:26:13 +0100	[thread overview]
Message-ID: <20080606142613.GA22495@shareable.org> (raw)
In-Reply-To: <patchbomb.1212643369@sermon.lab.mkp.net>

Martin K. Petersen wrote:
> Comments and suggestions are welcome.

Flash devices and SSDs (solid-state storage) in general are becoming
more common.

Also, backing a disk with flash.  And increasingly people will stripe,
parity, mirror or concatenate disks and flash just because it's
convenient.

--> So it would be nice if some of the flash alignment characteristics
could be reported.

Some aspects of flash don't fit into block devices - e.g. erase block
and write order requirements.  That's MTD stuff, not appropriate here.

But SSDs present a block device interface, and they still have
alignment characteristics for performance.  Even more important, when
combining multiple SSDs into a RAID.

-- Jamie

  parent reply	other threads:[~2008-06-06 14:26 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-05  5:22 [PATCH 0 of 3] [RFC] I/O Hints Martin K. Petersen
2008-06-05  5:22 ` [PATCH 1 of 3] block: Export I/O hints for block devices and partitions Martin K. Petersen
2008-06-05 14:42   ` James Bottomley
2008-06-06  1:18     ` Martin K. Petersen
2008-06-06 14:21   ` Jamie Lokier
2008-06-05  5:22 ` [PATCH 2 of 3] md: Export preferred I/O sizes and physical alignment Martin K. Petersen
2008-06-05  5:22 ` [PATCH 3 of 3] sd: Export preferred I/O sizes Martin K. Petersen
2008-06-05 11:25   ` Boaz Harrosh
2008-06-05  6:27 ` [PATCH 0 of 3] [RFC] I/O Hints Andreas Dilger
2008-06-05 10:32   ` Jamie Lokier
2008-06-05 12:35   ` Matthew Wilcox
2008-06-05 17:02     ` Dan Williams
2008-06-06  1:03   ` Martin K. Petersen
2008-06-06 14:02     ` Jamie Lokier
2008-06-06 16:48       ` Martin K. Petersen
2008-06-09 10:47         ` Jamie Lokier
2008-06-10  2:17           ` Martin K. Petersen
2008-06-05 10:40 ` Jamie Lokier
2008-06-05 19:19   ` Andreas Dilger
2008-06-06 12:55     ` Jamie Lokier
2008-06-06  1:16   ` Martin K. Petersen
2008-06-06  4:51     ` Dave Chinner
2008-06-06 16:53       ` Martin K. Petersen
2008-06-07 20:54         ` Dave Chinner
2008-06-09 15:05           ` Martin K. Petersen
2008-06-06 12:52     ` Jamie Lokier
2008-06-06 14:26 ` Jamie Lokier [this message]
2008-06-06 16:56   ` Martin K. Petersen

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