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Re: [Xen-users] Re: How to Backup and Restore MBR within Logical Volumes?
- To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
- From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>
- Date: Thu, 12 Nov 2009 20:53:52 +0800
- Cc: "Community assistance, encouragement, and advice for using Fedora." <fedora-list@xxxxxxxxxx>, space.time.universe@xxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx, Fedora Xen <fedora-xen@xxxxxxxxxx>
- Delivery-date: Thu, 12 Nov 2009 04:54:38 -0800
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On Thu, Nov 12, 2009 at 6:37 PM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
On Thu, Nov 12, 2009 at 5:10 PM, Mr. Teo En Ming (Zhang Enming)
> 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)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@xxxxxxxxx
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore
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