restoring snapshots when a clone is being made

Aashika · 12-03-2014, 12:22 AM

hi,
Is there any way to restore snapshots when clone is being created on the same machine??

unSpawn · 12-03-2014, 01:16 AM

Quote:

Originally Posted by Aashika

Is there any way to restore snapshots when clone is being created on the same machine??

In laymans terms creating a clone is reading blocks and copying them. A snapshot is like an index of blocks and positions. Restoring a snapshot is like finding out which blocks changed and reverting them. So restoring a snapshot and cloning at the same time would be like trying to rebuild a bridge on one side and at the same time demolishing it on the other side. It's an excellent way to fsck up the integrity of the VM. *If you are not bound to using local storage have a look at networked storage using ZFS pools.

rknichols · 12-03-2014, 02:42 PM

You could create a second snapshot, then clone that snapshot while restoring the primary volume. It's really no different from making a temporary snapshot for a backup process while the original volume continues to be in use read-write. Just be sure that snapshot isn't going to run out of space during the process. It should grow to essentially the same size as the snapshot you are restoring.

peter_b123 · 12-03-2014, 04:14 PM

Quote:

Originally Posted by unSpawn

In laymans terms creating a clone is reading blocks and copying them. A snapshot is like an index of blocks and positions. Restoring a snapshot is like finding out which blocks changed and reverting them. So restoring a snapshot and cloning at the same time would be like trying to rebuild a bridge on one side and at the same time demolishing it on the other side. It's an excellent way to fsck up the integrity of the VM. *If you are not bound to using local storage have a look at networked storage using ZFS pools.

I chuckled at that. Thanks for the laugh. Sorry to interrupt.