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Full Discussion: Backup and restore
Operating Systems AIX Backup and restore Post 302563224 by rbatte1 on Monday 10th of October 2011 11:29:26 AM
Old 10-10-2011
Hmmm, not a good starting point.

The good news is that the SAN definition of PP size should be irrelevant. It might cost you a little bit of usable space, but that's probably minimal. Your problem will be that you are moving from AIX LV mirrors to hardware mirrors (however the SAN protects the allocated disk) so I have a question about you backup process.

Do you use mkszfile before each mksysb? If so, then you may have got a way round things, but you are still exposing yourself to risks of hdisk0 failing during the backup before the mirror on hdisk1 is complete. Removing the mirrors will clear the disk, so it's not like a split mirror that some other systems have or Veritas can provide. You must also remember to use bosboot and check the bootlist after the mirror.

It might be better to:-
  1. Run mksysfile to generate an up-to-date configuration file, mirrors and all.
  2. Edit /image.data and set all COPIES= 2 statements to be COPIES= 1
  3. Run mksysb
Be aware that your tape will only create a single copy, so if you recover to a machine without hardware protected boot disk, you would need to manaully mirror afterwards, including the bosboot and edit of the bootlist If you have to recover to your live system, install to a single disk rather that risk the restore spreading out over both disks.


For your data volume group, it is unclear if the logical volumes are mirrored or how you back them up. If not mirrored, then you are exposed to hardware failure at any time. If they are, then you can perform similar actions, but it would be good to know the backup method for the data before I leap into something. What would your DR recovery procedure be like too? It's all well and good to say you have a backup, but have you tested your restore plan?


Let me know what you have in place and I will see about other suggestions to further protect you. Is it savevg, tar, cpio or perhaps a 3rd party backup tool?




Robin
Liverpool/Blackburn
UK
 

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volrootmir(8)						      System Manager's Manual						     volrootmir(8)

NAME
volrootmir - Mirror areas necessary for booting to a new disk SYNOPSIS
/usr/sbin/volrootmir [-a] [nconfig=count] target_disk [swap=target_partition] OPTIONS
Specifies that all volumes on the system disk be mirrored, not just the root and swap volumes, rootvol and swapvol. DESCRIPTION
The volrootmir script causes a mirror copy of areas of the root disk involved in booting to be made on the specified target disk. When used without the -a option, volrootmir adds mirrors of the root and swap volumes and allocates them on the new disk. In addition, all disk regions required for booting are set up and partitions for the new volume mirrors are created. When used with the -a option, volrootmir mirrors all in-use partitions on the system disk. To mirror a swap volume that is on a separate disk from the root volume, the swap attribute must be used to specify a separate target for the swap mirror. The target disk(s) must be at least as large as the sum of the sizes of rootvol and swapvol. Also, the physical disk should not have any disk partition in use. This script can be called from the voldiskadm menus by choosing the Mirror volumes on a disk operation. ATTRIBUTES
Specifies the number of log copies and copies of the configuration database, for example, nconfig=2. Specifies that the swap volume, swapvol, be mirrored on a separate disk, as specified by target_partition. EXAMPLES
The following command mirrors the rootvol and swapvol volumes onto the target disk, dsk3. This command will fail if swapvol is on a differ- ent disk from rootvol. # volrootmir dsk3 The following command mirrors rootvol, swapvol, and any other volumes on the root disk onto the target disk, dsk3. This command will fail if swapvol is on a different disk from rootvol. # volrootmir -a dsk3 The following command mirrors rootvol on disk dsk3, swapvol onto partition dsk7d, and any other volumes on the root disk onto disk dsk3. This command will fail if swapvol is on the same disk as rootvol. # volrootmir -a dsk3 swap=dsk7d The following command mirrors rootvol onto disk dsk3 and swapvol onto partition dsk7d. This command will fail if swapvol is on the same disk as rootvol. # volrootmir dsk3 swap=dsk7d SEE ALSO
volintro(8), voldiskadm(8) volrootmir(8)
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