Originally posted by: Karl_Milliken

Is it possible to convert an exisiting standard VG to an enhanced concurrent VG?
Or do you have to backup; create new EC VG; restore into new VG; and remove the old VG?

Thanks for any help.
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Originally posted by: tony.evans

From man chvg,

{-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.

Enhanced Concurrent volume groups use Group Services. Group Services ships with HACMP ES and must be configured prior to activating a volume group in this mode.

Use this flag to change a volume group into an Enhanced Concurrent Capable volume group. Notes:
1 Enhanced Concurrent volume groups use Group Services. Group Services ships with HACMP ES and must be configured prior to activating a volume group in this mode.
2 Only Enhanced Concurrent Capable volume groups are supported when running with a 64-bit kernel. Concurrent Capable volume groups are not supported when running with a 64-bit kernel.
}
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Originally posted by: Claudio

I don't remember in which PowerHA release it was introduced, but there is
also a CSPOC SMIT Menu that does exactly this (in "Shared Volume Groups":

Enable a Shared Volume Group for Fast Disk Takeover

and the F1 SMIT Help writes:
Converts a shared volume group to an enhanced concurrent mode
volume group. For more information, please see the chvg man page

Thanks, Claudio.
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Originally posted by: Karl_Milliken

That's exactly what I was looking for.
The "Enable a Shared Volume Group for Fast Disk Takeover" SMIT menu is available in HA 5.5 (I just did not notice it), but the -C flag to chvg could be used with earlier versions - not sure when that was added to AIX, but I see it in AIX 5300-05.
Thanks Claudio. Thanks Tony.
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