On Fri, Nov 13, 2009 at 5:40 AM, Sergey Vlasov <[email protected]> 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 > [email protected] > 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: [email protected] Mobile Phone (Starhub Prepaid): +65-8369-2618 Street: Bedok Reservoir Road Country: Singapore
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