Dell PowerVault MD3420 - Manual (Page 65)

To add a new base virtual disk to a consistency group and create a new repository virtual disk using a disk
pool:
set consistencyGroup ["consistencyGroupName"]
addCGMemberVolume="baseVirtualDiskName" repositoryVirtualDisk=("diskPoolName"
capacity=capacityValue(KB|MB|GB|TB|bytes))
Restrictions
• The Snapshot premium feature must be enabled on the storage array.
• To add a new member virtual disk, the consistency group must fewer than the maximum number of
virtual disks allowed in your configuration.
• If the base virtual disk resides on a standard disk group, the repository members for any associated
consistency group can reside on either a standard disk group or a disk pool. If a base virtual disk
resides on a disk pool, the repository members for any associated consistency group must reside on
the same disk pool as the base virtual disk.
• You cannot add a virtual disk to a consistency group that is in a Failed state.
Removing A Member Virtual Disk From A Consistency Group
When removing a member virtual disk from an existing snapshot consistency group, you can also delete
the repository virtual disk members from the consistency group, if desired.
The remove command syntax is shown below:
set consistencyGroup ["consistencyGroupName"]
removeCGMemberVirtualDisk="memberVirtualDiskName"
[deleteRepositoryMembers=(TRUE | FALSE)]
The removeCGMemberVirtualDisk parameter is the name of the member virtual disk that you want to
remove; deleteRepositoryMembers determines whether the command removes all the repository
members from the consistency group.
To remove a virtual disk names payroll-backup from a consistency group named CGGroup_1, but
preserve the repository virtual disks:
set consistencyGroup ["CGGroup_1"] removeCGMemberVirtualDisk="payroll_backup"
deleteRepositoryMembers=FALSE;
To remove CGGroup_1, as well as all repository virtual disks:
set consistencyGroup ["CGGroup_1"] removeCGMemberVirtualDisk=" payroll_backup"
deleteRepositoryMembers=TRUE;
Or omit the deleteRepositoryMembers parameter, which invokes the default value of preserving
repository virtual disks:
set consistencyGroup ["CGGroup_1"] removeCGMemberVirtualDisk=" payroll_backup";
Changing The Pre-read Consistency Check Setting Of An Overall Repository
Virtual Disk
Use the Pre-Read Consistency Check option to define a storage array's capability to pre-read an overall
repository virtual disk consistency information and determine whether the data of that overall repository
virtual disk is consistent. An overall repository virtual disk that has this feature enabled returns read errors
if the data is determined to be inconsistent by the RAID controller module firmware.
You can enable this option for overall repository virtual disks that contain consistency information. RAID
Level 1, RAID Level 5, and RAID Level 6 maintain redundancy information.
You can change the Pre-Read Consistency Check for an overall repository for the following storage
objects:
65