change VG Mode

I am trying to change "VG Mode: Non-Concurrent" to "VG Mode:        Concurrent".  chvg -c or -C doesn't help.

How do yo change it?

thx much

VOLUME GROUP:   prod8vg                  VG IDENTIFIER:  00cdcbdc00004c000000011
VG STATE:       active                   PP SIZE:        128 megabyte(s)
VG PERMISSION:  read/write               TOTAL PPs:      861 (110208 megabytes)
MAX LVs:        256                      FREE PPs:       861 (110208 megabytes)
LVs:            0                        USED PPs:       0 (0 megabytes)
OPEN LVs:       0                        QUORUM:         2
TOTAL PVs:      3                        VG DESCRIPTORS: 3
STALE PVs:      0                        STALE PPs:      0
ACTIVE PVs:     3                        AUTO ON:        no
Concurrent:     Enhanced-Capable         Auto-Concurrent: Disabled
VG Mode:        Non-Concurrent                          
MAX PPs per PV: 1016                     MAX PVs:        32
LTG size:       128 kilobyte(s)          AUTO SYNC:      no
HOT SPARE:      no                       BB POLICY:      relocatable
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Duncan MeyersCommented:
Check that you have Cluster Resource Manager for HACMP software installed:
lslpp -L |grep cluster
cluster.clvm.rte or will be displayed

You need to stop HACMP to change the VG mode - so you'll need to organise an outage if this is a production system.


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