Dell PERC 4/SI - Manual (Page 49)

Configuration data is saved in both non-volatile random access memory (NVRAM) on the RAID controller and on the hard drives attached to the controller. This
maintains the integrity of the data on each drive, even if the drives have changed their target ID.
Perform the following steps to use drive roaming:
1. Turn off all power to the server and all hard drives, enclosures, and system components, then disconnect power cords from the system.
2. Open the host system by following the instructions in the host system technical documentation.
3. Move the drives to different positions on the backplane to change the SCSI ID.
4. Determine the SCSI ID and SCSI termination requirements.
5. Perform a safety check.
l Make sure the drives are inserted properly.
l Close the cabinet of the host system.
l Turn power on after completing the safety check.
6. Power on the system.
The controller then detects the RAID configuration from the configuration data on the drives.
Drive Migration
Drive migration is the transfer of a set of hard drives in an existing configuration from one controller to another. The drives must remain on the same channel
and be reinstalled in the same order as in the original configuration. The controller to which you migrate the drives cannot have an existing configuration.
Perform the following 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 hard
drives and the NVRAM.
2. Turn off all power to the server and all hard drives, enclosures, and system components, then disconnect power cords from the systems.
3. Open the host systems by following the instructions in the host system technical documentation.
4. Remove the unshielded, twisted pair, SCSI ribbon cable connectors from the internal drives or the shielded cables from the external drives you want to
migrate.
l Make sure pin 1 on the cable matches pin 1 on the connector.
l Make sure that the SCSI cables conform to all SCSI specifications.
5. Remove the hard drives from the first system and insert them into drive bays on the second.
6. Connect the SCSI cables to the hard drives in the second system.
7. Determine the SCSI ID and SCSI termination requirements.
8. Perform a safety check.
l Make sure all cables are properly attached.
l Make sure the RAID controller is properly installed.
NOTE: If you move a drive that is currently being rebuilt, the rebuild operation will restart, not resume.
NOTE: The default for SCSI termination is onboard SCSI termination enabled.
NOTE: Only complete configurations can be migrated; individual virtual disks cannot be migrated.
NOTE: Drive roaming and drive migration cannot be supported at the same time.
NOTE: When you perform a drive migration, move only the disks that make up the logical drive (not all the physical disks in an array), so you will
not see an NVRAM mismatch error (providing a configuration is on the destination controller). The NVRAM mismatch error appears only if you move
all of the physical drives to the other controller.
NOTE: The default for SCSI termination is onboard SCSI termination enabled.