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8/9/2019 Mirroring an Aix Volume Group
1/2
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
8/9/2019 Mirroring an Aix Volume Group
2/2
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