Dell PowerVault MD3000i Command Line Interface Guide - Page 101
Changing RAID Controller Module Ownership, Initializing a Physical Disk
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Use Service mode when you want to perform an operation, such as replacing a RAID controller module. Placing a RAID controller module in Service mode makes it unavailable for I/O operations. Placing a RAID controller module in Service mode also moves the disk groups from the RAID controller module to the second RAID controller module without affecting the disk groups' preferred path. Moving disk groups might significantly reduce performance. The disk groups are automatically transferred back to the preferred RAID controller module when it is placed back online. NOTICE: A multipath driver is required on all hosts and is the only supported configuration. If the multipath driver is not installed, the virtual disks will not be accessible. Before you place a RAID controller module in Service mode, ensure that a multipath driver is installed on all hosts using these virtual disks. To change the operational mode of a RAID controller module, run the following command: set controller [(0 | 1)] availability=(online | offline | serviceMode) Changing RAID Controller Module Ownership You can change which RAID controller module owns a virtual disk by using the set virtualDisk command. The following syntax is the general form of the command: set (allVirtualDisks | virtualDisk [virtualDiskName] | virtualDisks [virtualDiskName1 ... virtualDiskNamen] | virtualDisk ) owner= (0 | 1) Initializing a Physical Disk NOTICE: When you initialize a physical disk, all data on the physical disk is lost. You must initialize a physical disk when you have moved physical disks that were previously part of a disk group from one storage array to another. If you do not move the entire set of physical disks, the disk group and virtual disk information on the physical disks that you move is incomplete. Each physical disk that you move contains only part of the information defined for the Maintaining a Storage Array 101