Inter-Disk Controller Logical Paths - HP XP P9500 Software User's 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 between storage systems for Cnt Ac-J Zprovided
by an XP12000/XP10000, an XP24000/XP20000, and P9500 Disk Array. 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 volume in the P-VOL of the Cnt Ac-J Z that belongs to the primary storage system, and a
journal volume in the S-VOL of the Cnt Ac-J Z that belongs to the secondary storage system.
Multiple inter-disk controller paths established between the same storage system pairs are identified
by a PathID. One PathID can specify up to 8 physical paths between the same storage system
pairs. At present, only one PathID (PathID=00) can be established.
Continuous Access Journal operations require bidirectional inter-disk controller logical paths, which
are 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).
NOTE:
To establish a reverse-direction inter-disk controller logical path, set the route list and
register the command device on the storage system.
Figure 59 (page 97)
Figure 59 Overview of the Inter-Disk Controller Logical Path
shows the overview of the inter-DKC logical path.
The Logical Path Control Function
97
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