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Full Discussion: AIX altinst_rootvg
Operating Systems AIX AIX altinst_rootvg Post 303035987 by bakunin on Tuesday 11th of June 2019 03:04:50 PM
Old 06-11-2019
I think, first an explanation what this "altinst_rootvg" is is in order:

When you are updating AIX there is always a non-zero chance of something going wrong so that you may want to roll back. With AIX 5.2 (IIRC - not sure about that) IBM introduced the "alternate disk installation". First, here is the principle:

- you start with a mirrored rootvg, where you have two disks. Each holding one mirror.
- you break up the mirror so that you have two identical copies
- then you update one with the new version while retaining the other as it is
- if everything goes right, the second (not updated) mirror is remirrored from the updated one so that you have a mirrored rootvg again (new version)
- if something goes wrong, reboot from the not-updated original, remirror the updated one from this so that you have a mirrored rootvg again (old version)

OK, with this in mind: notice that you first need to remove any installed emergency fixes before you update. Second, you do NOT do what i described above by hand! You use the adequate commands: alt_disk_install, alt_disk_copy, etc.. Read up on them before you attempt any update using them! There are options to alt_disk_install to create/remove the rootvg copies. Use only these, do NOT doctor with what the commands have created. Here is a link with the procedure.

Also notice that your NIM-server should ALWAYS be higher than or at least at the same level as your highest system. A NIM server with AIX 6.1 can only serve clients up to 6.1 and todays this means it is almost useless (AIX 6.1 is out of support in a few weeks). Your NIM-server should right now be at AIX 7.2 latest TL, even if the rest of your environment is 7.1 (which, btw., i think is a good idea). You can always serve clients below the NIMs level but never above.

I hope this helps.

bakunin
 

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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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