Messages in this thread |  | | | Date | Fri, 13 Aug 2010 16:08:10 +0200 | | From | Tomasz Torcz <> | | Subject | Re: [PATCH 2/2] Btrfs-progs: Add hot data support in mkfs |
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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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