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Top Forums UNIX for Advanced & Expert Users Installation through mksysb image backup Post 302905549 by rbatte1 on Thursday 12th of June 2014 06:02:39 AM
Old 06-12-2014
Annoyingly, you can't write direct from the mksysb command like you can with tape and the write might take 3 hours by the way. There is time and space taken to manipulate the mksysb image file ready for the write (25 minutes maybe) but the write to real media is slow.

If your mksysb image file is about 2Gb (must fit a single DVD I think) then you will need 5Gb free in rootvg so it can build /mkcd/cd_fs and /mkcd/cd_images at an appropriate size (determined for you in the mkdvd script)


Before you create your mksysb image, make sure you save an structural image of any volume groups you want to rebuild too like this:-
Code:
rm -r /tmp/vgdata                          # Clear out any old definitions
mkszfile                                   # Create rootvg requirements
for vg in `lsvg|sort|grep -v rootvg`
do
   echo "^\\\./" > /etc/exclude.$vg        # Exclude all files, i.e. take just the structure
   savevg -ef /disaster/$vg.structure $vg
done

# Now run mksysb as you normally would to a file
# Then run mkdvd to write to media

If the directory /disaster is in the rootvg then these will be available on the recovery. You can use:-
Code:
restvg -qf /disaster/vg-name.structure hdisk2 hdisk3 hdisk4....

This will build your replacement volume groups to match the sizes you had at the time. It will restore (and mount) filesystems and raw logical volumes and then you can recover your business data from whatever other backup solution you have.

It is less error prone and far quicker that having a scripted mkvg-mklv-crfs. On a recovery where we stopped issuing all the makes & creates and used restvg instead, we saved 4 hours just on the step to recreate the disk layout.



Robin
 

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BOOTCDBACKUP(1) 						   bootcd utils 						   BOOTCDBACKUP(1)

NAME
bootcdbackup - create a bootable offline backup of a unix system SYNOPSIS
bootcdbackup [-i] [-v] [-s] [-c <config directory>] [-url <url] [-nomount] [-2diskconf <file>] <dev> <name> <builddir> DESCRIPTION
bootcdbackup creates a offline backup from a installed system. You need a running bootcd to boot the system with. This CD/DVD is booted on the system and bootcdbackup creates a bootable CD/DVD with the bootcd kernel and the backup disk as tar-file. To restore or clone the system, boot the CD/DVD image and install it with bootcd2disk -c <name> on the system. bootcdbackup can try to discover the disk partition by searching for fstab on the given partition. A other way to backup the partition ta- ble is the program bootcdmk2diskconf which creates a configuration file on a running system. OPTIONS
-i The bootcdbackup runs in interactive mode and you can run each function manually. This option is useful for debugging. -v The option "-v" (verbose) adds messages on running. -s This option can be used to disable interactive questions and to try to ignore errors. -c <config directory> The configuration directory which includes the file "bootcdbackup.conf", default is "/etc/bootcd". -url <url> If bootcdbackup is slow on your system (because of a slow CD/DVD drive or the HP ILO virtual CD interface), you can use an image server to get the image from. bootcdbackup use the SWAP partition of your upcoming system as temporary space and copy the image from the configured image server to this partition and use it as image. The image server url is configured with this option. -nomount The target disk should not be mounted and no search for fstab is done. --cpio Normally as backup tool star will be used if selinux files have to be backed up and cpio will be used if not. With this option the usage of cpio can be forced. --star Normally as backup tool star will be used if selinux files have to be backed up and cpio will be used if not. With this option the usage of star can be forced. -2diskconf <file> The parameter configures a bootcd2disk.conf for the restore of the system done by bootcd2disk. The configuration file can be created with the command bootcdmk2diskconf. <dev> Configures the device where bootcdbackup finds the file "fstab" and discover the configuration for the restore. <name> The name of the backup (no blanks!) is used on the creation time and to restore the backup with bootcd2disk -c <name>. <builddir> Builddir is an directory on the backup system where bootcdbackup build the backup CD/DVD. Space for the CD/DVD image, for compression and the data is needed! All other configuration has to be done in the config files. FILES
/etc/bootcd/bootcdbackup.conf Configuration for bootcdbackup. SEE ALSO
Documentation in bootcdbackup.conf bootcdbackup.conf(5), bootcd(1), bootcdflopcp(1), bootcdwrite(1) AUTHOR
This manual page was written by Bernd Schumacher <bernd.schumacher@hp.com> and Carsten Dinkelmann <Carsten.Dinkelmann@foobar-cpa.de> for the Debian GNU/Linux system (but may be used by others). bootcdbackup 2007-07-05 BOOTCDBACKUP(1)
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