SRDF/async Steps

Question

Hello, We are moving a server from one dmx to another dmx. If anyone can review the steps we will be using to migrate using SRDF. Note - Luns from target dmx is already allocated to the server. 1. the dba/apps are down. 2. server team sets all VGs to not vary on and reboots server. 3. server team remove all emc disks from the server. 4. disable the source dmx zones 5. set dyn_rdf1_only on source r1 luns. 6. write disable the r2 luns since using -invalidate option 7. create a pair file and put r1 and r2 devices in the text file 8. create a pair with adaptive copy disk mode using cmd - symrdf -file file.txt -sid <> -rdfg # createpair -type R1 -invalidate R2 -rdf_mode acp_disk -nop 9. check pair creation using cmd - symrdf -sid <> list -rdfg # 10.Begin Actual Synchronization using cmd - symrdf -f file.txt establish -sid <> -rdfg # 11. Monitor the Synchronization symrdf -f file.txt query -sid <> -rdfg # 12. When sync is almost done ,change mode to Synchronous symrdf -f file.txt -sid <> set mode sync -rdfg # 13. Monitor and run query again and the state will be synchronized - symrdf -f file.txt query -sid <> -rdfg # 14. Split the srdf - will be done once state is synchronized symrdf -f file.txt split -sid <> -rdfg # 15. After the split,handover to server team to verify the data and Luns. 16. Once data has been verified ,do server team shut down the server ? and then we remove the dyn_rdf2_only from r2 luns and delete the pair ?

PedalHarder · Answer

That sounds fine, but you can create the RDF and do the adaptive copy while the app is up. This part does not need to be in the critical path. Should not need a host outage to remove RDF.

sauravrohilla · Answer

Just to add another point after your step number 5, dyn_rdf flag needs to be enable on the R2 side and Jason is right, there is no need to shut off the application while the migration is going on. It needs to be shut only when you are switching to R2 side.

regards,

Saurabh

PedalHarder · Answer

SRDF operations need to be performed against all devices in an SRDF/A session. This does not apply to clone / Snap.

Symmetrix

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