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DateFri, 13 Aug 2010 16:08:10 +0200
FromTomasz Torcz <>
SubjectRe: [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@gmail.com wrote:
> > From: Ben Chociej <bchociej@gmail.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@chrome.pl 72->| 80->|


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