Continuous Access Xp Asynchronous Consistency Groups; Remote Copy Connections; Continuous Access Xp Supported Raid Level Configurations - HP StorageWorks XP12000 User Manual

Table 3 Continuous Access XP supported RAID level configurations
For P-VOL
RAID 1
RAID 1
RAID 5
RAID 1
RAID 5
RAID 5
RAID 6
RAID 6
RAID 6

Continuous Access XP Asynchronous consistency groups

A Continuous Access XP Asynchronous consistency group is a user-defined set of volume pairs across
which update sequence consistency is maintained and ensured at the remote site. Each Continuous
Access XP Async volume pair must be assigned to a consistency group. Continuous Access XP can
configure up to 128 consistency groups (0-7F) for each MCU and provides group-based operations for
consistency groups (for example, split and resync group). Use consistency groups to maintain update
sequence consistency for databases spanning multiple volumes, allowing immediate database recovery
at the remote site when needed. See
for further information.
Only Continuous Access XP Asynchronous pairs belonging to the same CLPR can be allocated to one
Continuous Access XP consistency group. For more information about CLPRs, see the HP StorageWorks
XP Disk/Cache Partition user guide.

Remote copy connections

Remote copy connections are physical paths MCUs use to communicate with RCUs. The number of
physical paths in the MCU is limited to eight per logical CU image. MCUs and RCUs are connected via
Fibre Channel interface cables.
When Fibre Channel interface connections are used, switches are required for distances greater than
0.5 km (1,640 feet). Distances up to 1.5 km (4,920 feet, 0.93 miles) are supported with dual switches
utilizing shortwave connections. Distances up to 10 km (6.2 miles) are supported using dual switches
with longwave connections. Distances up to 30 km (18.6 miles) are supported using dual switches with
longhaul connections. Distances up to 100 km are supported by using dual switches with DWDM. See
Fibre Channel remote copy connections
Channel remote copy connections.
The MCU-to-RCU remote copy configuration for Continuous Access XP Asynchronous has different
requirements than the Continuous Access XP Synchronous configuration, as follows:
• Continuous Access XP Synchronous supports 1-to-n and n-to-1 remote copy connections (n≤4).
One MCU can be connected to as many as four RCUs. One RCU can be connected to as many
as four MCUs (one MCU/RCU = one physical CU, including all sixteen CU images).
• Continuous Access XP Asynchronous supports 1-to-1 remote copy connections within the same
consistency group. P-VOLs and S-VOLs of pairs in a consistency group must be within one
physical MCU and one physical RCU. This configuration ensures backup integrity for a data set
spread across multiple volumes within one array (such as large databases).
Continuous Access XP Asynchronous 1-to-n and n-to-1 (n ≤ 4) configurations (one main disk array and
multiple remote disk arrays) are valid for Continuous Access XP Asynchronous if all volumes belonging
to a single consistency group are only 1-to-1.
For S-VOL
RAID 1
RAID 6
RAID 5
RAID 5
RAID 1
RAID 6
RAID 1
RAID 5
RAID 6
Continuous Access XP Asynchronous consistency group operations
for further information about installing and configuring Fibre
Continuous Access XP user guide
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