Dell PowerVault MD3260i CLI Guide - Page 85

Setting RAID Controller Module Operational Mode, Changing RAID Controller Module Ownership

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Setting RAID Controller Module Operational Mode A RAID controller module has three operational modes: • Online • Offline • Service CAUTION: Placing a RAID controller module offline can cause loss of data. Placing a RAID controller module online sets it to the Optimal state and makes it active and available for I/O operations. Placing a RAID controller module offline makes it unavailable for I/O operations and moves its disk groups to the other RAID controller module if failover protection is enabled. Taking a RAID controller module offline can seriously impact data integrity and storage array operation. If you take a RAID controller module offline, the second RAID controller module in the pair takes over. Disk groups and their associated virtual disks that were assigned to the offline RAID controller module are automatically reassigned to the remaining RAID controller module. CAUTION: Place a RAID controller module in Service mode only under the direction of Technical Support. 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. CAUTION: A multipath driver is required on all hosts and is the only supported configuration. If the multipath driver is not installed, the virtual disks are not 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 CAUTION: 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 virtual disk and disk group. To be able to reuse the physical disks to create a new disk group and virtual disk, you must erase all old information from the physical disks by initializing the physical disk. 85

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Setting RAID Controller Module Operational Mode
A RAID controller module has three operational modes:
•
Online
•
Offline
•
Service
CAUTION: Placing a RAID controller module offline can cause loss of data.
Placing a RAID controller module online sets it to the Optimal state and makes it active and available for I/O operations.
Placing a RAID controller module offline makes it unavailable for I/O operations and moves its disk groups to the other
RAID controller module if failover protection is enabled.
Taking a RAID controller module offline can seriously impact data integrity and storage array operation.
If you take a RAID controller module offline, the second RAID controller module in the pair takes over. Disk groups and
their associated virtual disks that were assigned to the offline RAID controller module are automatically reassigned to
the remaining RAID controller module.
CAUTION: Place a RAID controller module in Service mode only under the direction of Technical Support.
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.
CAUTION: A multipath driver is required on all hosts and is the only supported configuration. If the multipath driver
is not installed, the virtual disks are not 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 <
wwid
> owner=(0 | 1)
Initializing A Physical Disk
CAUTION: 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 virtual disk and disk group. To be able to reuse the physical disks to create a new disk group
and virtual disk, you must erase all old information from the physical disks by initializing the physical disk.
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