On Fri, Aug 13, 2010 at 9:08 AM, Tomasz Torcz <tomek@xxxxxxxxxxxxxx> wrote: > On Fri, Aug 13, 2010 at 05:14:22PM +0400, Andrey Panin wrote: >> On 224, 08 12, 2010 at 05:29:37PM -0500, bchociej@xxxxxxxxx wrote: >> > From: Ben Chociej <bchociej@xxxxxxxxx> >> > >> > 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@xxxxxxxxx 72->| 80->| > > This is very much just a first cut. Our goal here was to get a lot of the legwork and experimental coding out of the way to enable to Btrfs to *fully* tackle heterogeneous storage in the future. BC -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
