In case of a disk server has problem, you want save downtime as short as possible, one option is to move the disk drives connected to its MegaRAID controller to other same type of MegaRAID controller in other server so you could bring the storage up as soon as possible.

MegaRAID controller supports this feature, drive migration is the transfer of a set of drives in an existing configuration from one controller to another. The drives must remain on the same channel and must be reinstalled in the same order as in the original configuration. The controller to which you migrate the drives cannot have an existing configuration.

NOTE Partial configurations, which include individual virtual drives, can be migrated.
NOTE Drive roaming and drive migration cannot be supported at the same time.

Follow these steps to migrate drives:
1. Make sure that you clear the configuration on the system to which you migrate the drives to prevent a
configuration data mismatch between the drives and the NVSRAM.

NOTE:
When you migrate drives, move only the drives that make up the
virtual drive (not all of the drives in a drive group), so that you do not
see an NVSRAM mismatch error (providing a configuration is on the
destination controller). The NVSRAM mismatch error appears only if
you move all of the drives to the other controller.

2. Turn off power to the server and all drives, enclosures, and system components. Disconnect the power cords from the systems.
3. Open the host system by following the instructions in the host system technical documentation.
4. Either remove the SAS cable connectors from the internal drives, or remove the shielded cables from the external drives that you want to migrate.
     a. Make sure that pin 1 on the cable matches pin 1 on the connector.
     b. Make sure that the SAS cables conform to all SAS specifications.
5. Remove the drives from the first system, and insert them into the drive bays on the second system.
6. Connect the SAS cables to the drives in the second system.
7. Determine the SAS target requirements.
8. Perform a safety check.
     a. Make sure that all of the cables are attached correctly.
     b. Make sure that the RAID controller is installed correctly.
     c. Close the cabinet of the host system.
9. Reconnect the power cords to the system.
10. Turn on the power to the system.


The controller detects the RAID configuration from the configuration data on the drives.