IBM Redbooks ServeRAID-MR10i, User Manual

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Summary of the ServeRAID-MR10i SAS/SATA Controller Characteristics 1-13
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Supports a Flash ROM interface, a nonvolatile static RAM
(NVSRAM) interface, and a pipelined synchronous burst SRAM
(PSBRAM) interface
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Offers a flexible programming interface to tune I/O performance
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Allows mixed connections to SAS targets or SATA II targets
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Leverages compatible connectors for SAS connectors and SATA II
connections
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Allows grouping of up to four PHYs in a single quad port to form a
wide port
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Allows programming of the World Wide Name
1.6.7 Drive Roaming
Drive roaming occurs when the physical disks 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.
Note: In a clustering environment, drive roaming is supported
within the same channel only.
Configuration data is saved in both the NVRAM on the RAID controller
and on the physical disks attached to the controller. This action maintains
the integrity of the data on each drive, even if the drives have changed
their target ID.
Note: If you move a drive that is being rebuilt, the rebuild
operation will restart, not resume.
Follow these steps to use drive roaming:
Step 1. Turn off all power to the server and all physical disks,
enclosures, and system components. Disconnect the power
cords from the system.
Step 2. Open the host system by following the instructions in the host
system technical documentation.
Step 3. Move the drives to different positions on the backplane to
change the targets.
Step 4. Determine the SAS target requirements.