[OpenIndiana-discuss] ZFS Snapshot question

[Jan Owoc]

On Fri, Aug 3, 2012 at 6:43 AM, Kees Nuyt <k.nuyt at zonnet.nl> wrote:
> On Thu, 2 Aug 2012 14:59:13 -0600, you wrote:
>>Having said that, I believe they need to be mounted in empty
>>directories, so you'd have to do:
>># mv datastore/vmimages/server1 datastore/vmimages/server1.bak
>># zfs create -o [options here] datastore/vmimages/server1
>># cp -a datastore/vmimages/server1.bak/* datastore/vmimages/server1
>># rm -r datastore/vmimages/server1.bak
>
> Another procedure would be to
> - take all VM's down
> - zfs rename datastore/vmimages to datastore/oldimages
> - zfs create datastore/vmimages
> - zfs create datastore/vmimages/server1
> - mv /datastore/oldimages/server1/* /datastore/vmimages/server1/
> - zfs create datastore/vmimages/server2
> - mv /datastore/oldimages/server2/* /datastore/vmimages/server2/

Actually, Kees' procedure is better. I didn't remember off the top of
my head whether one can do an "mv" command between different
filesystems (some OSes don't like it; OI seems to handle it ok, and
does it even across pools).

While you're recreating the filesystems anyway, I suggest you do a
quick read through the possible options for creating a new filesystem
- some can only be specified on creation. Ones I like to set include
atime (off), casesensitivity (mixed, for SMB sharing), nbmand (on),
utf8only (on), normalization (formD, for cross-OS compatibility),
checksum (sha256), snapdir (visible - I like to see the .zfs).

Jan