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

[Mr. Teo En Ming (Zhang Enming)]

On Thu, Nov 12, 2009 at 6:37 PM, Fajar A. Nugraha <fajar(a)fajar.net&gt; wrote:

>  On Thu, Nov 12, 2009 at 5:10 PM, Mr. Teo En Ming (Zhang Enming)
>  <space.time.universe(a)gmail.com&gt; 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.
>  LZMA
>  > 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
Engineering)
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