[Gluster-users] accessing snapshot from client

[Rajesh Joseph]

----- Original Message -----
> From: "Maged Mokhtar" <magedsmokhtar at gmail.com>
> To: gluster-users at gluster.org
> Sent: Saturday, November 29, 2014 1:24:07 AM
> Subject: [Gluster-users] accessing snapshot from client
> 
> Hi,
> 
> i am trying to use snapshot feature using gluster 3.6.1, i am not sure how i
> can make the client see the snapshot.
> 
> i created a replica volume on 2 servers, the bricks were mounted from thin
> lvm volumes:
> gluster vol create gvol1 replica 2 storage1:/gluster-server/mount1/brick1
> storage2:/gluster-server/mount1/brick1
> 
> i also created a snapshot:
> gluster snapshot create gvol1-snap1 gvol1
> 
> it returns success, i can see the snapshot using:
> gluster snapshot list
> gluster snapshot info gvol1-snap1 ( shows Status started )
> gluster snapshot status gvol1-snap1 ( Shows brick path
> /var/run/gluster/snaps/XX on both storage servers )
> 
> i can also see the snapshot with preserved data mounted in
> /var/run/gluster/snaps/XX
> 
> 1) Now how do i access this snapshot from a client ? if i try to run
> mount -t glusterfs storage1:gvol1-snap1 /gluster-client/gvol1-snap1
> this does not work, it does not give an error but the mount is empty

The syntax is not correct. You should mount the snapshot with the following command:
mount -t glusterfs <hostname>:/snaps/<snapname>/<parent-volname> /mount_point
e.g.

mount -t glusterfs storage1:/snaps/gvol1-snap1/gvol1  /gluster-client/gvol1-snap1

> 
> 2) i also tried using uss ( user servicable snapshots )
> gluster volume set gvol1 features.uss enable
> returned success but i do not see the .snap dirs in my main mount.

.snaps folder is a virtual folder and is not visible in the mount.
User need to explicitly cd into the .snaps folder.

e.g. if you run "ls -a" on /gluster-client/gvol1-snap1 folder you will not
see .snaps folder but you can cd into /gluster-client/gvol1-snap1/.snaps folder.

Hope that helps.

Best Regards,
Rajesh