On Mon, 01 Sep 2008 01:51:51 -0400, Shaya Potter wrote:
> As I mentioned a while ago, we jury rigged writable snapshots by
> combining nilfs w/ unionfs.
Yeah, I remember.
It sounds much better at least than switching with rsync :)
> Instead of writing to the root of the file system, you right to a subdir.
>
> so we start w/ /nilfs/t0
>
> when we want to rollback and continue to work
>
> we mount the ro snapshot on /s0 and create /nilfs/t1 use unionfs to
> union together /s0 (ro) and /nilfs/t1 (rw).
I've tried this without making sub directories:
# mkdir /nilfs /snap-ro /snap-rw /change
# mount -t nilfs2 /dev/sdb1 /nilfs
...
# mkcp -s
# lscp
CNO DATE TIME MODE SKT NBLKINC ICNT
...
62305 2008-09-01 16:13:28 ss - 488 39
62306 2008-09-01 16:13:33 cp - 8 39
# mount -t nilfs2 -o ro,cp=62305 /dev/sdb1 /snap-ro
# mount -t unionfs -o dirs=/snap-ro=rw unionfs /snap-rw
# unionctl /snap-rw --add --before /snap-ro --mode rw /change
<use /snap-rw as a writable snapshot mount>
# mount
...
/dev/sdb1 on /nilfs type nilfs2 (rw,gcpid=9512)
/dev/sdb1 on /snap-ro type nilfs2 (ro,cp=62305)
unionfs on /snap-rw type unionfs (rw,dirs=/snap-ro=rw)
It's working fine.
Is there a quicker way? (Or something to add?)
Cheers,
Ryusuke
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