HP P6000 Replication Solutions Manager CLI Reference (T3680-96071, June 2012)

• All members of a DR group must have a common preferred controller. HP recommends that
all members have the same presentation status (required if members belong to one application).
• Failover is permitted only by specifying a destination DR group.
• When failsafe mode is enabled, a DR group cannot be suspended.
• A suspended DR group cannot be failed over and its members cannot be removed. The
exception is that, if the intersite links are broken, a suspended DR group can be failed over.
• A DR group cannot be deleted if a member of the destination DR group is presented.
• To be added to a source DR group, a virtual disk:
Cannot be a member of another DR group◦
◦ Cannot be a snapshot
◦ Cannot be a mirrorclone
◦ Must be in a normal operational state
◦ Must use mirrored cache
◦ Cannot be a thin provisioned virtual disk and
◦ Cannot be greater than 2 TB in size
Vraid hierarchy
Vraid levels provide the following relative redundancy:
• Vraid1 is the highest redundancy level and uses the most raw capacity.
• Vraid6 is a medium redundancy level. It uses less raw capacity than Vraid1 but more raw
capacity than Vraid5.
• Vraid5 is a medium redundancy level. It uses less raw capacity than Vraid6 but more raw
capacity than Vraid0.
• Vraid0 is the lowest redundancy level and uses the least raw capacity.
Thin provisioning guidelines
Thin provisioning is a controller software-based feature that allows you specify the capacity of a
virtual disk that you create. The physically allocated space will dynamically increase from 0 to the
requested capacity as data is added to the virtual disk. In an EVA, thin provisioning requires:
• An HP P6000 Command View license installed on the array
• A standalone disk
• An HSV300, HSV340, HSV360, HSV400, or HSV450 controller
• The requested capacity must be between 1 GB and 32 TB
• The requested capacity must be less than largest capacity of a corresponding thin provisioned
RAID type in the array
10 Overview