anoopcr
2 Iron

SRDF help needed

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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.


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JohnToner1
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Re: SRDF help needed

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Try a 'symrdf -sid 4757 -rdfg 3 -file rdf.txt disable' command first, then re-try your commands.

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JohnToner1
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Re: SRDF help needed

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Try a 'symrdf -sid 4757 -rdfg 3 -file rdf.txt disable' command first, then re-try your commands.

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anoopcr
2 Iron

Re: SRDF help needed

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If I issue symrdf -sid 4757 -rdfg 3 -file rdf.txt disable, will it create any production issue ?

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JohnToner1
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Re: SRDF help needed

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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.

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sauravrohilla
3 Argentium

Re: SRDF help needed

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Alternatively, you can use cons_exempt flag while doing the move pair or the deletepair on the consistency enabled ra group.

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anoopcr
2 Iron

Re: SRDF help needed

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Hi John,

It worked.Thanks for your help.

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dkakljkml
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Re: SRDF help needed

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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

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dkakljkml
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Re: SRDF help needed

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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

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Re: SRDF help needed

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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...

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dkakljkml
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Re: SRDF help needed

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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.

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