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Mirroring an AIX volume group (e.g. for machines with 2 system

disks)

1. configure additional disks (if not yet recognized)

smit C

Devices - Install/Configure Devices Added After IPL2. add disks to existing VG's

smit CSystem Storage Management - LVM - Volume Groups - Set Characteristics ... - Add a Physical

Volume to a Volume Group

3. Mirror the volume group,

Method 1 (traditional), by LVsmit -C

System Storage Management - LVM - Logical Volumes - Set Characteristics ... -

Add a Copy to a Logical Volume

selection list via F4 key. (forrootvg the LVs hd6,hd8,hd4,hd2,hd9var,hd3,hd1,... have tobe selected, unfortunately one after the other separately. hd5must not be mirrored this way) Fill

the following entries and submit:

NEW TOTAL number of logical partition 2

SYNCHRONIZE the data in the new yes

logical partition copies?

Be patient, this might take some time because data has to be copied to the mirror disk.

For a rootvg (only) the mirror copy must be made bootable

mklv -y hd51 -t boot -a e rootvg 2 hdiskxbosboot -a -l /dev/hd51 -d /dev/hdiskx

bootlist -m normal hdisky hdiskx

where hdiskx is the additional physical volume holding the mirror and hdisky the original

(x,y=0..n )

Method 2 (new, faster), by VGsmitty

System Storage Management - LVM - Logical Volumes - Volume Groups - Mirror a

Volume Group

PHYSICAL VOLUME names [hdiskx]

Number of COPIES 2

Be patient, this might take some time because data has to be copied to the mirror disk. As

suggested, for a rootvg (only) the mirror copy must be made bootable

bosboot -a -l /dev/hd5 -d /dev/hdiskx

bosboot -a -l /dev/hd5 -d /dev/hdisky

bootlist -m normal hdisky hdiskx

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4. Switch off the disk quorum for the volume group.

smit CSystem Storage Management - Volume Groups - Set Characteristics ... - Change a Volume Group

selection list via F4 key. Fill the following entries (example fordbavg) and submit.

* VOLUME GROUP name dbavg

* Activate volume group AUTOMATICALLY yes +

at system restart?

* A QUORUM of disks required to keep the volume no +

group on-line ?

5.

Ensure synchronization of mirror and original, e.g.:

syncvg -v rootvg

syncvg -v dbavg