Migrate Data from one SAN to other in AlwaysON configuration with no/minimal downtime
Team,
There is a requirement to move the current DBs from existing SAN to new IBM SAN disks. I have outlined the below steps. Request you to please add your inputs/challenges/risks.
This is in Always ON and We have 3 Nodes.
Server A , Server B and Server C
A and B are Synchronous
C is hosting Async replica.
Note: The SQL binaries are installed on E: drive which is a SAN drive. Whether is this going to be impacted based on my steps below?
Present the new SAN of same size on all the nodes in the Availability Cluster.
Break the secondary replica. On Secondary replica, Migrate the data by physically moving the DB files from old SAN to new SAN.
Rename the new SANs back to the original filenames as it was present earlier. Bring up the services and join to Availability Group. Check whether the DBs are Synchronized with Primary.
Now, Failover the Primary to Secondary replica- This will be a short outage.
Follow the same steps on Primary as mentioned in Steps 1-3.
Check the Synchronization of the DBs and perform all the sanity checks.
Thanks!
Sharath
Best Regards, Sharath
Hi Sharath,
This can be easily achieved by storage migration by storage Vendor, In your case IBM should be able to do it, since they have sophisticated tools
(one of these tools is Storage Virtualization for Data Migration and Consolidation) to this SAN migration they don't need downtime during the storage sync process. your downtime will be only the Cutoff Time, If SAN Vendor does the Data Migration for you. <o:p></o:p>
Otherwise,
1. Take out read-only replica out of Always on Group.
2. Since SQL is also installed on SAN drive, I strongly suggest you to rebuild the SQL Server as new. (No Copy of Data from SAN to SAN)
Note: Drive allocation and drive letters should be identical
3. Once you rebuild the SQL Server, One Challenge here is to migrate the SQL Logins (You must migrate users using same SID, to avoid permission issues).
4. then Add it Always on Group, and wait for the databases to sync.
5.
Then manually move the always on group read/write replica to new node.
6. follow the steps 1 ,2,3 and 4 in sequence.
Hope this will help you.
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