[Xen-users] Re: How to Backup and Restore MBR within Logical Volumes?

Mr. Teo En Ming (Zhang Enming) space.time.universe at gmail.com
Thu Nov 12 12:53:52 UTC 2009

On Thu, Nov 12, 2009 at 6:37 PM, Fajar A. Nugraha <fajar at fajar.net> wrote:

> On Thu, Nov 12, 2009 at 5:10 PM, Mr. Teo En Ming (Zhang Enming)
> <space.time.universe at gmail.com> wrote:
> > Hi,
> >
> > I don't think I will be using the LVM snapshot method. I will simply
> ensure
> > that my domU is not running,
> Ah, so you can live with the down time. It makes things a lot simpler then.
> > then I proceed to do the losetup and kpartx
> > procedure.
> Like others mentioned, you don't need losetup for LVs. It will only
> make things slower.
> > Subsequently I will backup the MBR of my domU by dd-ing
> > /dev/loopX and clone all the filesystems of the domU using fsarchiver.
> >
> > I would like to use fsarchiver because it can support LZMA compression.
> > can compress better than bzip2 and decompress 3x faster than bzip2.
> > partimage only supports gzip and bzip2.
> If your concern is the size and speed of backup, here's one final note
> from me: you might want to look at zfs. Possible use scenarios :
> - use opensolaris as dom0. Probably the most supported option when it
> comes to xen + zfs, but you need to be familiar with how opensolaris
> works.
> - use external storage server running solaris/opensolaris as iscsi
> SAN. Think of it as poor-man's Netapp.
> - use zfs-fuse inside Linux dom0, and store domU storage as files
> - use zfs-fuse on domU, and do backup from domU instead of dom0.
> With zfs, you'd get zfs snapshot (which is like instaneous in-place
> backup), incremental block-level send (can greatly reduce backup
> storage size if your data doesn't change often), optional transparent
> compression for live data (like what ntfs has).
> --
> Fajar

I am not familiar with OpenSolaris but that may change with time.

Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
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