HP XP Continuous Access Software - Manual (Page 48)

NOTE:
Administrator or Continuous Access XP Journal write access to Command View XP or XP Remote Web
Console is required to perform Continuous Access XP Journal operations. Users without Administrator or
Continuous Access XP Journal write access can only view Continuous Access XP Journal information.
• About the license of Continuous Access XP Journal — If you want to use Continuous Access XP
Journal, you must install not only a license for Continuous Access XP Journal but also a license
for Continuous Access XP and Continuous Access XP Asynchronous. Also, the license capacity
of Continuous Access XP Journal, the license capacity of Continuous Access XP and the license
capacity of Continuous Access XP Asynchronous must satisfy the following equation: License
capacity of Continuous Access XP ≥ License capacity of Continuous Access XP Asynchronous ≥
License capacity of Continuous Access XP Journal.
Requirements and Restrictions for Continuous Access XP
Journal
One-to-one volume copy operations
Continuous Access XP Journal normally requires a one-to-one relationship between logical volumes and
volume pairs. You can normally assign a volume (LU) to only one Continuous Access XP Journal pair
at a time. However, when creating a Continuous Access XP Journal pair for delta resync operations,
you can specify the normal Continuous Access XP Journal secondary volume to also be the delta resync
secondary volume (see Figure 31 ). In that case, you must create a mirror for the delta resync pair and the
non-delta resync pair. For more information, see Continuous Access XP Journal delta resync operations
and Combining Continuous Access XP Journal with Continuous Access XP Synchronous (3DC multi-target
configuration) .
NOTE:
Continuous Access XP Journal does not support operations in which one primary data volume is copied
to more than one Continuous Access XP Journal secondary data volume, or more than one Continuous
Access XP Journal primary data volumes are copied to one secondary data volume.
Because Continuous Access XP Journal operates on logical volumes rather than files, multivolume files
require special attention. For complete duplication and recovery of a multivolume file (for example,
a large database file spanning several volumes), ensure that all the file's volumes are copied to the
Continuous Access XP Journal secondary data volume, and use Continuous Access XP Journal to ensure
update sequence consistency across this group of secondary data volumes.
Logical unit (LU) types
The following DKC and DKU emulation types can be used for Continuous Access XP Journal.
Table 9 Supported emulation types
Emulation Supported type
DKC
(mainframe)
3990-6E, 2105, or 2107
DKU (Drive) OPEN-V
NOTE:
Only OPEN-V can be used for journal volumes.
Continuous Access XP Journal displays the emulation types of primary and secondary data volumes.
48 Continuous Access XP Journal operations requirements and restrictions