Off Host SnapShot

I was just revising my VxVM fundas, since it has been quite sometime before I have actually done it. More involved with backup off late.

Fast-Resync FlashSnap (Licensed Feature), Lets discuss 3rd mirror snapshot only as I have worked only on this feature.

Step 1 : Test bed starts with creation of a volume.

vxassist -g datadg make vol01 10g

Step 2 : Enable Fast Resync

vxsnap -g datadg prepare vol01

This also adds a DCO (Data Change Object), tracks changes and is

persistent across reboots.

Step 3 : Add mirror to the volume.

vxsnap -g datadg addmir datavol

This will add a mirror plex to the vol01, lets call it vol01-02

Step 4 : Now to create instant FULL sized snapshot.

vxsnap -g datadg make source=vol01/newvol=snapvol01/plex=vol01-02

Step 5 : Off host snap shot.

vxdg split datadg offdg snapvol01

Step 6 : Deport the DG

vxdg deport offdg

Step 7 : On the remote host, import the DG and mount. Use this

copy to perform backup operations, MIS e.t.c.

Step 8 : Deport the dg on the remote host.

vxdg deport offdg

Step 9 : Import it back on the original host.

vxdg import offdg

Step 10 : Join the DG's

vxdg join offdg datadg

Step 11 : Start the snapshot vol

vxvol -g datadg startall

Step 12 : Refresh the snapshot volume with the original volume.

vxsnap -g datadg refresh snapvol01 vol01