HP XP P9000 Command View Advanced Edition Software - Manual (Page 169)

• Creating copy groups , page 160
• Defining copy groups in a multi-target or cascade configuration , page 168
Using snapshot groups
This module describes the use of snapshot groups:
• About snapshot groups , page 169
• Snapshot group requirements , page 170
• Snapshot group configuration workflow , page 170
• Creating a snapshot group , page 171
• Viewing or modifying snapshot groups , page 172
• Deleting a snapshot group , page 172
• Migrating copy groups to snapshot groups , page 173
NOTE:
Snapshot groups are only supported on HP P9500 and XP7 storage systems.
About snapshot groups
A snapshot group is a group of pairs created using the Fast Snap copy type. Like copy groups,
snapshot groups allow the same operation to be applied to more than one pair at a time.
For most configurations, the number of generations supported for copy groups is 64 or (less). Snapshot
groups support either 512 or 1,024 generations depending on how they are created. Replication
Manager can only be used to configure a maximum of 512 generations (one generation per snapshot
group). Configurations up to 1,024 (multiple generations per snapshot group) created outside of
Replication Manager will be correctly accessed and displayed, but are not recommended.
Snapshot groups differ from normal copy groups in the following ways:
• Like device groups, snapshot groups are managed in the storage system rather than a configuration
definition file.
• Snapshot groups store copy pairs (snapshots) directly.
• Snapshot groups require XP7 Remote Web Console to set the authentication mode of the command
device. In turn, you must use
raidcom -login on the pair management server prior to performing
snapshot group operations.
• The Change Pair Status Wizard is only used to change pair status of snapshot groups. The Pair
Configuration Wizard is used exclusively for creation and deletion.
• Snapshot group names cannot be changed.
• MU (generation) numbers are assigned to snapshot groups automatically and cannot be specified.
NOTE:
When the constituent copy pairs are modified individually (rather than as a group), the snapshot
group may have multiple MU numbers as a result.
• Although consistency groups are supported, the CTG ID is assigned automatically by the storage
system and cannot be specified.
User Guide 169