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

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Date:	Fri, 13 Aug 2010 17:14:22 +0400
From:	"Andrey Panin" <pazke@...trinvest.ru>
To:	bchociej@...il.com
Cc:	chris.mason@...cle.com, linux-btrfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...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 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 ?
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