linux-kernel - Re: [PATCH 2/2] Btrfs-progs: Add hot data support in mkfs

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Message-ID: <20100813140810.GB24029@mother.pipebreaker.pl>
Date:	Fri, 13 Aug 2010 16:08:10 +0200
From:	Tomasz Torcz <tomek@...ebreaker.pl>
To:	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	bchociej@...il.com, chris.mason@...cle.com,
	linux-fsdevel@...r.kernel.org, cmm@...ibm.com, bcchocie@...ibm.com,
	mrlupfer@...ibm.com, crscott@...ibm.com, mlupfer@...il.com,
	conscott@...edu
Subject: Re: [PATCH 2/2] Btrfs-progs: Add hot data support in mkfs

On Fri, Aug 13, 2010 at 05:14:22PM +0400, Andrey Panin wrote:
> On 224, 08 12, 2010 at 05:29:37PM -0500, bchociej@...il.com wrote:
> > From: Ben Chociej <bchociej@...il.com>
> > 
> > Modified mkfs.btrfs to add hot data relocation option (-h) which
> > preallocates BTRFS_BLOCK_GROUP_DATA_SSD and
> > BTRFS_BLOCK_GROUP_METADATA_SSD at mkfs time for future use by hot data
> > relocation code.  Also added a userspace function to detect whether a
> > block device is an SSD by reading the sysfs block queue rotational flag.
> 
> IMHO this policy is too inflexible. What if I have large array of slow SATA 
> disks and some fast SAS ones ?

  I'm hoping that this is just first cut, and future versions will have options.
For now, it is totally unusable without a way of using mirrored SSD for
hot data.
  Ideally, hot storage devices should be online selectable and changeable.

-- 
Tomasz Torcz                                                       72->|   80->|
xmpp: zdzichubg@...ome.pl                                          72->|   80->|

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