Dynamic RDF Group Modification

Question

I have an existing Dynamic RDF group called CWVDYN1. I have some meta devices that are rdf_enabled.I have tried to issue the command createpair, but receive the error that that dynamic group already exists. I think I am missing a step. How do I add 1 new devices to the R1 and R2 side, pair them and have them as part of the CWVDYN1 group? Do I have to split the R1 and R2 first?

Is there a best practice for the number of dynamic RDF groups used? Should I stick with only 1 with many devices or create more groups that separate similar servers, functions and platforms?

Thanks.

Allen Ward · Answer

I'm still learning some of this stuff myself, but what I've been having to do is create the pairs without specifying a device group to add them too... then once they are recognized as an RDF pair I can add them to the device group.

This was giving me some real trouble last week since it is a bit different ( I think) from when we originally built the environment.

Allen Ward · Answer

That is exactly what I was using, but I left off the -g XXX at the end

Once the pairing was created I was able to add the R1 to the device group.

Just be aware that to do the createpair with the invalidate option the R2 devices have to be set to write disabled (I think not ready works too).

JZR · Answer

Can you give me a example of the syntax you are using? Here is an example of what I am issuing.

symrdf createpair -file hlanndp006.dat -sid 0110 -rdfg 3 -invalidate r2 -type rdf1 -g CWVDYN1

the file contain the following. R1 and R2
$ cat hlanndp006.dat
c14 582
c15 583
c16 584

Thanks

xe2sdc · Answer

symrdf createpair -file hlanndp006.dat -sid 0110 -rdfg 3 -invalidate r2 -type rdf1 -g CWVDYN1

AFAIK this command will try to CREATE the group CWVDYN1 and put all the devices in the dg .. but since the DG already exists, it will fail

Why don't you create a different group and later (after the creation) move all the devices from the new (temporary) DG to the good old CWVDYN1 ??

You can also follow Allen directions and use the pairfile only to create the pairs and later throw the devs in the existing DG via symld

-s-

RRR · Answer

That's how I'd do it: create a temporary group to be able to control the new paired devices and after the initial sync is done, delete the group and add the devs to the already existing group.

xe2sdc · Answer

That's how I'd do it: create a temporary group to be
able to control the new paired devices and after the
initial sync is done, delete the group and add the
devs to the already existing group.

You can:

symrdf -rdfg xxx -sid yyy -file pairifle -type Rx -invalidate R2 createpair -g TempDgName

to create the DG while also creating the pairs and

symld -g TempDgName moveall DestDgName [-force] [-rename]

to move the devices from the temporary group to the real DG ..

Symmetrix

Dynamic RDF Group Modification

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