Xen project Mailing List

On Fri, Nov 13, 2009 at 5:35 PM, Mr. Teo En Ming (Zhang Enming) <space.time.universe@xxxxxxxxx> wrote:

On Fri, Nov 13, 2009 at 1:25 PM, Mr. Teo En Ming (Zhang Enming) <space.time.universe@xxxxxxxxx> wrote:

On Fri, Nov 13, 2009 at 11:17 AM, Mr. Teo En Ming (Zhang Enming) <space.time.universe@xxxxxxxxx> wrote:

On Fri, Nov 13, 2009 at 5:40 AM, Sergey Vlasov <vsu@xxxxxxxxxxx> wrote:

On Fri, Nov 13, 2009 at 12:57:22AM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
[...]

> # VM 11: Rocks 5.1 x86_64 HPC Compute Cluster HVM domU
>
> kpartx -av /dev/virtualmachines/rocks0001
>
> dd if=/dev/virtualmachines/rocks0001 of=$DEST/rocks0001.mbr bs=512 count=1
>
> partimage -d -M -b -z1 save /dev/mapper/virtualmachines-rocks0001p1
> $DEST/virtualmachines-rocks0001p1.img
>
> partimage -d -M -b -z1 save /dev/mapper/virtualmachines-rocks0001p2
> $DEST/virtualmachines-rocks0001p2.img
>
> partimage -d -M -b -z1 save /dev/mapper/virtualmachines-rocks0001p5
> $DEST/virtualmachines-rocks0001p5.img

Note that this VM (and some other VMs listed in your script) uses
logical partitions. In this case just saving a copy of MBR will not
be enough to save partition layout - MBR describes only 4 primary
partitions, and restoring just MBR will not restore extended
partitions.

One way to backup the complete partition layout is by saving also
the output of "sfdisk -d $device"; the resulting file can be used as
input to sfdisk to restore all partitions, including logical ones.
Saving MBR is still needed together with sfdisk, because it saves
the boot code (used for HVM) and CHS geometry information (which can
be used during boot in some cases).

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)

iEYEARECAAYFAkr8gM8ACgkQW82GfkQfsqLa+QCaAqpO5NWhYHtKVi3M5ytERw27
eC0AnjsJuG34MAR1jZRejBiJCVybQvc1
=RRGH
-----END PGP SIGNATURE-----

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

Thank you for pointing this out. Otherwise I would made incomplete backups.

Would it be best practice to always backup both the MBR and the partition geometry using sfdisk whenever cloning our harddisks on desktops and servers?

Besides sfdisk, there are also other partitioning tools like fdisk, cfdisk, and parted.

Could these other tools also be used for backing up the partition geometry like sfdisk?

Thank you.

--
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

Hi,

I have made some improvements to the backup/cloning script. Please help me to vet it through for any mistakes. Thank you very much!

<SCRIPT>

***SNIPPED***

</SCRIPT>

--
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

Hi All,

This is the final version of my backup script. I have gone through the script once to make sure there are no mistakes. If I want to capture any errors during the execution of the backup/cloning script, which of the following commands do I run?

# ./backup-script.sh > backup.log

OR

# ./backup-script.sh 2> backup.log

After completing the backup script, I will proceed to write the restore script.

If there are any errors, please let me know because I do not want to make any mistakes with the cloning process. Thank you.

<SCRIPT>
***SNIPPED***
</SCRIPT>

--
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

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