Change VG Mode: Non-Concurrent

[gatetec]

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
7d58f6e08
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

 

[costiles]

The fastest way - and the best way is 'smitty chvg'!!!!

 

[khalidaaa]

taken from man chvg:

-c Same as -C flag. In AIX 5.2 and later only Enhanced Concurrent Capable volume groups will be created. 
-C Changes the volume group into an Enhanced Concurrent Capable volume group. Changes the volume group varied on in non-concurrent mode to Enhanced Concurrent Capable. This requires that the volume group be re-imported on all other nodes prior to activation in Enhanced Concurrent mode. Changes the volume group varied on in Concurrent mode to an Enhanced Concurrent mode volume group. Only use the -C flag with the HACMP(TM) ES. It has no effect on volume groups and systems not using the HACMP ES product.

http://publib.boulder.ibm.com/infoc...topic=/com.ibm.aix.cmds/doc/aixcmds1/chvg.htm

This should ok! You need to stop HACMP while doing this!

Regards,
Khalid

 

[gatetec]

I can't stop HACMP as to it is production.
Is there any ramification with having VG Mode: Non-Concurrent until HA being restarted?

thx much

 

[khalidaaa]

You still can leave it non-concurrent until you find gap for downtime.

I never tried this to be honest but that's what the man pages says

This requires that the volume group be re-imported on all other nodes prior to activation in Enhanced Concurrent mode.

I have an HACMP test environment which is running in non-concurrent mode. I will try changing it to enhanced concurrent and will let you know how it goes! unfortunatly now its weekend so i will try it once i go back to work.


Regards,
Khalid

 

[dial8d]

Why are you changing the volume group ?

You need to take additional care with enhanced concurrent volume groups. Always use C-SPOC to manipulate them, never directly on the command line.