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Operating Systems AIX Regarding AIX volume manager & replacing a disk Post 302622563 by zaxxon on Thursday 12th of April 2012 10:33:29 AM
Old 04-12-2012
mirrorvg will follow the settings for the LVs to be mirrored. So if they are set to "strict", at least every PP of the mirrored LP will be placed on a different PV in a VG. If you have more than 2 PVs in a VG they can be scattered on PVs you did not intend to use. Ie. it could happen that if disks on one side get broken, it could hit both mirror copies of the LP which is what should be avoided at all costs and what you are trying to do.

Code:
# lslv root_lv| grep EACH
EACH LP COPY ON A SEPARATE PV ?: yes

But to make sure there is no mixup of PPs belonging to different mirrored LVs from the same VG, you can check this placement with for example:
Code:
# lsvg -M rootvg

You see things like:
Code:
hdisk1:280      hd4:6:2

From the man page of lsvg, specifically -M:
Code:
PVname:PPnum [LVname: LPnum [:Copynum] [PPstate]]

(PPstate is not displayed here)
So if you see the same LV name with :1 and :2, which is the copy number on the same PV (hdisk1), then you have a problem - it would mean the allocation of LP copies is not strict for that LV. If you have LP copies of one LV on the same PV as that from another mirrored LV, then you have a problem too, as from your description you want to have both LV copies on separate disks, ie. each LV mirror has his dedicated mirror disk/PV.
To rearrange the placement you will have to use the command migratelp to move the LPs to the correct PV (note that the order of arguments/parameters of migratelp is different to the order you get from the output of lsvg -M!).
That's a lot of work so a script scanning for wrong placement and then migrating to free PPs is a bit of work, but helpful.

By this you can also check if the placement is/was as wanted, before you changed the disk.

Last edited by zaxxon; 04-12-2012 at 11:59 AM.. Reason: rearranged and added info, spelling etc.
 

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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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