HP StorageWorks Continuous Access XP Journal user guide (T1778-96001, June 2006)

40 Continuous Access XP Journal operations requirements and restrictions
Requirements and Restrictions for Continuous Access XP Journal
One-to-one volume copy operations
NOTE: Continuous Access XP Journal does not support operations in which one primary data volume is
copied to more than one secondary data volume, or more than one primary data volume is 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.
Continuous Access XP Journal displays the emulation types of primary and secondary data volumes.
Table 10 lists the volumes and volume capacities that can be used for Continuous Access XP Journal data
and journal volumes.
NOTE: The capacity of a journal volume is not included in the accounting capacity.
Table 9 Supported emulation types
Emulation Supported type
DKC 3990-6E, 2105
DKU (Drive) OPEN-V
NOTE: Only OPEN-V can be used for journal volumes.
Table 10 Supported data and journal volumes
Type Support specifications
Data volume Journal volume
Custom Volume Size volume Available
Cache LUN XP volume Available
Maximum volume capacity Maximum capacity of volume for each emulation type
Minimum volume capacity Minimum capacity of a Custom Volume
Size volume.
Minimum capacity of a Custom Volume
Size volume.
NOTE: A journal groups consists of
areas containing journal data and an
area containing metadata for remote
copy.