VPLEX: Data mobility migration is failing with error message." NullPointerException: while extracting elements on property extent-migrations"

When starting either a batch migration or a single device migration, the below error message is seen:

> failed. cause: while extracting elements on property extent-migrations: NullPointerException

Data mobility migration is failing with error message." NullPointerException: while extracting elements on property extent-migrations"

Resolution:
This issue is fixed in GeoSynchrony 6.2 Patch 4 and later.

Workaround:

Only during the migration window it is advisable to switch to RestV1, then revert to RestV2 once migrations are completed.

Once migrations are completed we need to move back to RestV2 as V2 is faster than V1.
 

1. Log in to the management server, then change directory (cd) to /var/log/VPlex/cli
2. Once in /var/log/VPlex/cli vi the file instance.properties and make the below changes . 

            uncomment VPlexRESTv2Enabled if there is a # symbol in front of it.
            #VPlexRESTv2Enabled=true

            Then change "true" to "false"
            VPlexRESTv2Enabled=false

           when done save and quit the vi session by typing :wq
 

3. Restart management console.

           sudo /etc/init.d/VplexManagementConsole restart
 

4. Then rerun the migration job.
5. After finishing the migration job, revert back from RestV1 to RestV2.
6. From the management server prompt, if not in the /var/log/VPlex/cli/ directory cd to it.
7. Once in the /var/log/VPlex/cli directory, vi the instance.properties files as follows:

           change VPlexRESTEnabled from false to true.

            from:
            VPlexRESTv2Enabled=false

            to:
            VPlexRESTv2Enabled=true

            When edits are done, save and quit the vi session by typing :wq
 

8. Restart the management console.

           sudo /etc/init.d/VplexManagementConsole restart