Avago Technologies MegaRAID SAS 9240-4i - Manual (Page 15)

LSI Corporation
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6Gb/s MegaRAID SAS RAID Controllers User Guide
August 2013
Overview
Summary of 6Gb/s MegaRAID SATA+SAS RAID Controller Characteristics
 They permit grouping of up to four PHYs in a single quad port to form a wide port.
 They permit programming of the World Wide Name.
1.6.7 Drive Roaming
Drive roaming occurs when the drives are changed to different ports on the same controller. When the drives are
placed on different channels, the controller detects the RAID configuration from the configuration data on the drives.
Configuration data is saved in both the NVRAM on the RAID controller and on the drives attached to the controller.
This action maintains the integrity of the data on each drive, even if the drives have changed their physical device ID.
NOTE If you move a drive that is being rebuilt, the rebuild operation restarts;
it does not resume from the stopping point.
Follow these steps to use the drive roaming feature:
1. Turn off the power to the server and all drives, enclosures, and system components. Disconnect the 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 targets.
4. Determine the SAS target requirements.
5. Perform a safety check.
a. Make sure that the drives are inserted correctly.
b. Close the cabinet of the host system.
6. Reconnect the power cords to the system.
7. Turn on the power to the system.
The controller then detects the RAID configuration from the configuration data on the drives.
1.6.8 Drive Migration
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 NVRAM.
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 NVRAM mismatch error (providing a configuration is on the
destination controller). The NVRAM 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.