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Hi All,
I am planning to move few devices from 1 srdf group to the other.Currently all devices are in async mode and in consistent state.
I tried to execute the below command after splitting up the replication.(devices are in split status now)
symrdf -sid 4757 -rdfg 3 -file rdf.txt movepair -new_rdfg 4
But I am getting the below error:
The device does not have a valid RDF Consistency state for this operation
I found writes are happedning to the R1 devices.I tried to delete the pair also.getting same error.Any suggestion to resolve this issue.
Thanks in Advance.
John Toner
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Posted September 19th, 2011 09:00
No. This just disables the consistency protection for the SRDF/A pairs.
Consistency protection is used for SRDF/A devices. When enabled, if a single R1 device in the RA group is unable to send its data to the R2, it drops entire group so it maintains a consistency copy on the R2 side.
To re-enable consistency protection, you would just issue the 'symrdf enable' command once your movepair operation is completed.
sauravrohilla
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Posted September 19th, 2011 10:00
Alternatively, you can use cons_exempt flag while doing the move pair or the deletepair on the consistency enabled ra group.
I have some issue understanding the use of symrdf enable in single session setup. I have one source and target connection to each other with Async mode . What scenario do you think enabling symrdf enable on the Async group will help. I dont see any possibility of a single lun going bad in the Vmax world with thin pool . Can you help me to understand how enabling consistency will benefit
hello Subash,
I have some issue understanding the use of symrdf enable in single session setup. I have one source and target connection to each other with Async mode . What scenario do you think enabling symrdf enable on the Async group will help. I dont see any possibility of a single lun going bad in the Vmax world with thin pool . Can you help me to understand how enabling consistency will benefit
Archuperi721
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Posted June 29th, 2013 22:00
dkakljkml,
How would do you feel that single source and target replication session going to be out of consistent state?
John Toner has given the answer in the third reply...
Hi Archiperi,
As I mentioned earlier, i don't see a scenario where a device will go bad in the RA group . If we where using raid groups , yes in that case there is possibility of a device going bad , but with virtual providing I don't see that case. further I did some testing , I disabled one of the device ( on the source side) in the ra group with asyn mode and consistency enabled on the group, still after doing this it didn't drop the session.
sauravrohilla
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Posted July 1st, 2013 03:00
when you have a single source and single target but spanned across multiple physical ra link..
regards,
Saurabh
John Toner
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Posted September 19th, 2011 08:00
Try a 'symrdf -sid 4757 -rdfg 3 -file rdf.txt disable' command first, then re-try your commands.