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

Continuous Access XP Journal user guide 41
NOTE:
• Specify a port in SLPR 0 when using LUN Manager to define an LU path to a data volume. It is
possible, but not recommended, that you specify a port in another SLPR when defining an LU path. For
more information about SLPR 0, see the HP StorageWorks XP Disk/Cache Partition user guide.
• Volumes containing a volume management area (VMA) cannot be used as journal volumes. For more
information about VMA, see the HP StorageWorks LUN Security XP Extension user guide.
Table 11 lists emulation types and capacities of logical volumes that can form pairs. For more
information, see ”Maximum number of pairs” on page 41.
Continuous Access XP Journal also supports LUN Volume Manager on the local array, which allows you
to configure custom-size LUs that are smaller than standard-size LUs. When assigning custom-size LUs to a
Continuous Access XP Journal pair, the secondary data volume must have the same capacity as the
primary data volume.
Table 12 lists the emulation types and capacities of the master and restore journal volumes that can be
used for Continuous Access XP Journal.
Table 13 list the RAID-level combination of data and journal volumes in the journal group that can be
used for Continuous Access XP Journal.
RAID-5 and RAID-1 can coexist in the same journal group.
Maximum number of pairs
NOTE: The number of pairs you can create in an array is limited.
Use the number of cylinders and bitmap areas to calculate the maximum number of pairs you can create
in an array.
• Number of cylinders:
The number of pairs of a primary and a secondary data volume is limited. The number of pairs
depends on the volume capacity (that is, the number of cylinders in the volumes forming pairs). If you
use Custom Volume Size (CVS), the number of pairs depends on the number of cylinders that CVS
Table 11 Specifications for logical volumes that can form pairs
Item Support specification
Emulation type Same type of pair can be created for OPEN-V
Volume capacity Same capacity
Table 12 Journal volume specifications
Item Support specifications
Emulation type Same
NOTE: Only OPEN-V can be used for journal volumes.
Volume capacity Same or different amount of capacity is available
Table 13 RAID-level configuration of Continuous Access XP Journal
Item Support specifications
RAID configuration of data and journal volumes RAID-5 and RAID-1 can coexist