CMMVC6460E The command failed because the migration source is offline.

Explanation

The source of the migration is offline. The offline source is either an image mode MDisk or the entire managed disk group.

If you submitted the rmmdisk command and specified a regular MDisk, determine the managed disk group to which the source MDisk is defined, and follow the procedure for bringing the managed disk group online. There will be an entry in the error log for the corresponding managed disk group.
If you submitted the rmmdisk command and specified an image mode MDisk, determine the source MDisk and follow the procedure for bringing the image mode MDisk online. There will be an entry in the error log for the corresponding MDisks.
If you submitted a command to migrate a copy of an image mode VDisk, determine the corresponding source MDisk and follow the procedure for diagnosing problems with MDisks. There will be an entry in the error log for the corresponding MDisks.
If you submitted any other command to migrate a VDisk copy, determine the managed disk group to which the VDisk is defined, and follow the procedure for bringing the managed disk group online. There will be an entry in the error log for the corresponding managed disk group.