On Fri, Aug 19, 2016 at 08:07:31PM +0200, marcin@xxxxxxxx wrote: > Hi! > I'm spamming here with simple questions because it looks that documentation > doesn't follow current state of bcachefs. > > I've upgraded bcache-tools to b0f08fc1e30daafb274181234dae3408fb2eb69b and > linux-bcache to 9c79c00b0d02f0da5e01ad5cd1bf4ae2ce421d5d. > And now... > > 1. How to create simple bcachefs on one disk, without any cache? > # ./bcache format --meta_replicas=2 /dev/sdd1 > Please supply a device > > Help displays: > # ./bcache format --help > Usage: bcache format [OPTION]... <list of devices> > Create a new bcache volume from one or more devices > > Options: > -C, --cache=dev Format a cache device > -w, --block=size block size > -n, --btree_node=size Btree node size, default 256k > --metadata_csum_type=(none|crc32c|crc64) > Checksum type > --data_csum_type=(none|crc32c|crc64) > Checksum type > --compression_type=(none|gzip) > Compression type > --encrypted enable encryption > --meta_replicas=# number of metadata replicas > --data_replicas=# number of data replicas > --error_action=(continue|readonly|panic) > Action to take on filesystem error > -l, --label=label label > --uuid=uuid filesystem UUID > --fs_size=size Size of filesystem on device > -b, --bucket=size bucket size > -t, --tier=# tier of subsequent devices > --discard Enable discards > -q, --quiet reduce output to errors only > -v, --verbose increase output to include informational > messages > --help display this help and exit > --version output version information and exit > > Report bugs to <linux-bcache@xxxxxxxxxxxxxxx> > > I don't know what is correct syntax to format block device. > > 2. How to create and mount bcachefs witch cache device? > # ./bcache format --compression_type=lz4 --meta_replicas=2 /dev/sdd1 -C > /dev/sde1 Hey, sorry for the long delay, been sick past several days. The way arguments were passed to bcache format was a holdover from old style make-bcache, and didn't make much sense for bcachefs - -C was used for all devices, and --tier specifies fast devices and slow devices. I finally got around to redoing the option parsing so we don't need the -C argument today - update your bcache tools, and the command you want is now: bcache format --tier 0 /dev/sde1 --tier 1 /dev/sdd1 (assuming sde1 is your fast device and sdd1 is your slow device). Replication is not yet supported (it's around 90% implemented, but I haven't worked on it in ages and the tests haven't been covering it so you'll likely hit bugs if you try it). Compression still isn't _quite_ done, I reverted the accounting until I fix an issue with copygc. You can enable it and nothing will break, but it won't actually let you store more data in your fs than if it was uncompressed. -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
