HP XP P9000 Command View Advanced Edition Software - Manual (Page 378)

When selecting a secondary volume for a backup, you can either manually select the volume you
want or use the default. To have Replication Manager choose a secondary volume for you, you need
to use the volume copy function. When manually selecting a volume, choose the generation name
unique to the desired volume. Replication Manager creates generation names using the following
format:
local_MU# or remote_MU#
Each element used to create a unique generation name is described below:
Specify this when the secondary volume will be stored on the same storage system as the primary
volume.
local
Specify this when the secondary volume will be stored on a different storage system than the
primary volume.
remote
The MU number defined in the P9000 RAID Manager configuration definition file ( horcmn.conf ). MU#
When you back up data to a Continuous Access secondary volume (on a remote site), the assigned
generation name is
remote_0 .
As shown in Figure 12 , because there is a limit of three generations, the fourth generation must write
over one of the preexisting volumes. In this case, the oldest volume (generation 1) is overwritten.
Generations 5 and 6 follow the same pattern of overwriting the oldest, existing generation.
Figure 12 Backing up multiple generations
The order in which secondary volumes are used for backups does not change regardless of which
generation you might decide to restore at some point in time.
Figure 13 depicts how generations are
used.
TIP:
The number of generations that Replication Manager can manage depends on the volume replication
function and hardware used, but the same procedures are used for backup and restoration operations.
To determine the number of generations supported according to storage system and copy type, see
“
Copy pair configuration conditions ” on page 151.
Managing application replicas 378