On Wed, May 18, 2016 at 03:06:39PM +1000, Christopher James Halse Rogers wrote: > On Wed, May 18, 2016 at 2:01 PM, Kent Overstreet <kent.overstreet@xxxxxxxxx> > wrote: > > On Tue, May 17, 2016 at 07:46:33PM -0700, Martin McClure wrote: > > > On 05/12/2016 09:36 PM, Kent Overstreet wrote: > > > > > > > > Yeah - tiering replaces cache/backing devices > > > > > > > > IIRC, > > > > > > > > bcache format --tier 0 -C <SSD> --tier 1 -C <spinning rust> > > > > > > > > (the -C is going to go away at some point) > > > > > > > > > > Had a chance to play with this some more, but still not getting it > > > to > > > work... > > > > > > Formatting seems to work, and once I do this: > > > > > > echo /dev/sdd1 > /sys/fs/bcache/register > > > echo /dev/nvme0n1 > /sys/fs/bcache/register > > > echo 1 > /sys/fs/bcache/<set-uuid>/blockdev_volume_create > > > > > > a /dev/bcache0 has been created. However, if I try to mount it: > > > > > > mount -t bcache /dev/bcache0 /mnt > > > > > > it says: > > > > > > mount: No such file or directory > > > > > > with a return code of 32, which is documented as "mount failure". > > > > > > At this point I reach the limit of my current understanding, but > > > would > > > like to understand more. > > > > The intended mount path for multi device filesystems is currently > > broken... > > Chris got it working (to my surprise) by - I belive - registering all > > the > > devices via /sys/fs/bcache/register, and then mounting just one of the > > block > > devices - Chris, is that correct? > > That is indeed correct. Once the volume has all its components registered, > it can be mounted by any of the block devices. Actually, I just tested and mounting multile devices directly _does_ work - you just pass a colon separated list of devices to mount: mount -t bcache /dev/sdb:/dev/sdc /mnt I could have sworn this was broken, but worked just now... -- 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
