Inter-disk controller logical paths – HP XP P9500 Storage User Manual
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When the Reverse Resync function is used, an inter-control unit logical path from the secondary
site to the primary site (reverse direction) is also necessary. To establish a reverse direction
inter-control unit logical path, the route list needs to be set and the command device needs to be
registered.
NOTE:
When using the following models, you cannot establish or delete an inter-control unit
logical path from the secondary site to the primary site (reverse direction) by using the command
device.
•
XP1024/XP128 Disk Array
•
XP12000/XP10000 Disk Arrays that do not support Continuous Access Journal Z functions
Inter-disk controller logical paths
An inter-disk controller logical path is a logical path provided between an XP12000/XP10000,
an XP24000/XP20000, and/or XP P9500 for Cnt Ac-J Z operations between storage systems. It
is a virtual communication path established between the primary storage system and secondary
storage system on a physical path, when an MCU within the primary storage system and a RCU
within the secondary storage system are connected by at least one FC cable.
When an inter-disk controller logical path is established, communication is enabled between a
journal group that belongs to the primary storage system, and a journal group of the secondary
storage system.
Path group IDs can be specified to establish multiple inter-disk controller logical paths between the
same storage systems. If path group IDs are specified when defining journal groups, inter-disk
controller logical paths can be assigned for each journal group. Path group IDs are set for the
following purposes:
•
By specifying path group IDs for journal groups, different inter-disk controller logical paths
are assigned for each journal group. This can balance the load on inter-disk controller physical
paths.
Example: Different inter-disk controller logical paths are allocated for open system and
mainframe system replication and different physical paths are assigned to the logical paths.
•
One path group ID can specify up to eight physical paths between the same storage systems.
Therefore, the number of physical paths between storage systems can be increased by setting
multiple path group IDs.
Up to 64 path group IDs can be registered in each storage system.
Continuous Access Journal operations require bidirectional inter-disk controller logical paths from
the primary storage system to the secondary storage system (forward direction), as well as from
the secondary storage system to the primary storage system (reverse direction).
The bidirectional path group IDs (forward and reverse directions) must be the same in both journal
groups.
shows the overview of the inter-DKC logical path.
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Understanding Business Continuity Manager functions