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aureliandan1
4 Posts
0
3571
October 16th, 2013 07:00
SRDF/A consistency, movepair & suspend
Hi,
I would like to know if the consistency for an SRDF/A group is disabled if:
1. we move to our group a device pair from another rdf group
2. use suspend for one ore more device pairs in our group
Because is an SRDF/A group, -cons_exempt is used in both cases but I've seen examples where the last command is:
"symrdf ....... enable " after we have added new volumes to the SRDF/A group and resume the link.
so it appears that after a move or a suspend operation we need to re-enable the consistency
Also regarding movepair:
I would like to move a dev pair from a TEM rdf group to a SRDF/A group
on TEMP rdf group, I have adaptive copy mode for dev pair
Do I have to change mode to ASYNC before I use movepair or it doesn't matter, I can leave adaptive copy an the dev pair will inherit the ASYNC mode from the new rdf group ?
Thanks
aureliandan1
4 Posts
1947
0
Posted October 18th, 2013 04:00
if we want to suspend some device pairs from a SRDF/A group should we always use -force option:
.... suspend -cons_exempt -force
even if the dev pairs are in consistent state, just to be sure, or we should be careful with -force option ?
I've seen examples where -force was used as a default option for suspend operation for srdf groups in async and adaptive_copy mode
PedalHarder
4 Apprentice
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465 Posts
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Posted October 16th, 2013 16:00
Consistency on the SRDF/A group is not disabled when new devices are added with movepair (-cons_exempt). The same applies when suspending a device. The ENABLE you have seen may just be there for safety. I just tested the movepair to an SRDF/A group that was enabled and it stayed. The new device inherited the consistency enabled state.
With movepair, just do the MOVEPAIR from the temp group to the SRDF/A group and then RESUME. It does not need to be in SRDF/A mode before the movepair. This allows the temp group to contain any number of devices and you can move just a subset to your SRDF/A group.