HP StorageWorks XP Remote Web Console Software User Manual
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Figure 16 An Example of Connections Among Secondary Storage Systems
Based on the example in
, the following subsections explain configuration of
paths and ports, and creation of remote command devices.
Configuring Paths and Ports to Establish Connections among Secondary Storage Systems
To establish connections among secondary storage systems, you must configure external ports on
the storage system that should be used as the supervisor DKC. After that, you must configure paths
between these external ports and the target ports on the storage systems that should be used as
subordinate DKCs. In the example in
, secondary storage system 1 has external
ports, each of which is connected with a target port on secondary storage systems 2 and 3. For
details on external ports, see the HP XP24000/XP20000 External Storage Software User's Guide.
For details on configuring paths, see the HP XP24000/XP20000 LUN Manager User's Guide.
By using Fibre Channel switches, target ports can also be connected to RCU target ports on
secondary storage systems. For details on RCU target ports, see
“Initiator Ports and RCU Target
. For details on configuring ports, see
“Configuring Port Attributes” (page 139)
.
Creating Remote Command Devices to Establish Connections among Secondary Storage Systems
To establish connections among secondary storage systems, first you must create a command
device in each of the secondary storage systems. Next you must create a mapping between
command devices in the supervisor DKC and the subordinate DKCs. Thus, the supervisor DKC will
be able to use command devices in subordinate DKCs via remote command devices.
In the example of
, command devices A and B are created in secondary
storage systems 2 and 3. Also, remote command devices are created in secondary storage system
1 (that is, the supervisor DKC), and are mapped to secondary storage systems 2 and 3 (that is,
subordinate DKCs).
The emulation type of command devices and remote command devices must be OPEN-V. For
details on remote command devices, see the HP XP24000/XP20000 External Storage Software
User's Guide.
CAUTION:
Performing maintenance operations on remote command devices (for example, devices
A and B in
) used for connections between secondary storage systems will
cause the pairs to be suspended as if there was a failure. To avoid this, before performing
maintenance tasks, remove all journal groups in the extended consistency group that use the remote
command devices under maintenance.
Using Multiple Primary and Secondary Storage Systems
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