Re: [Xen-users] High availability and live migration with just LVMand hardware fencing

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

On Thursday 20 May 2010 00:48:54 Jeff Sturm wrote:
> > -----Original Message-----
> > From: Bart Coninckx [mailto:bart.coninckx@xxxxxxxxxx]
> > Sent: Wednesday, May 19, 2010 5:53 PM
> > To: John Madden
> > Cc: Javier Guerra Giraldez; Jeff Sturm; xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-users] High availability and live migration with just
> > LVMand hardware fencing
> >
> > Well, for (HVM) Windows guests I see it as a necessity basically: next to
> > backups of regular data, snapshotting will allow to take fast complete
> > backups of a temprarely suspended OS.
> 
> This may not be any help to you (yet), but I've read that blktap2 in Xen
>  4.0 can also create snapshots.
> 
> I agree snapshots are very useful, although not a substitute for
>  conventional backups.  Among other places, we use them on GFS
>  filesystems--we run gfs_tool to freeze the filesystem, create a snapshot
>  on our SAN, then unfreeze.  These provide a nice recovery point if
>  disaster strikes.
> 
> -Jeff
> 

I did some more thinking in regards to the snapshotting and came up with the 
following: the backend storage is an IET storage target. I could build the 
LUNs on top of LV's. This would give me snapshotting for the Xen setup. 
Granted, not very elegant, since for a restore I need to put the snapshot back 
and as a added action I need to connect to it from an iSCSI initiator in order 
to access the data. 

Would this be a "clever idea"? 

thx,


B.

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