Establishing connections – HP XP7 Storage User Manual
Page 34
•
The recommended method for executing RAID Manager commands is the in-band (host-based)
method. This prevents I/O response from deteriorating, which may occur with the out-of-band
(LAN-based) method.
•
When Cnt Ac-J and Cnt Ac-J Z journals are in the same RAID Manager consistency group, an
error in one journal can cause suspension of all journals. See
for more information:
•
It is not possible to register a journal to multiple RAID Manager consistency groups.
Establishing connections between multiple secondary systems
When using more than one primary system and more than one secondary system, connections
among the secondary systems must be established by configuring paths and ports.
To configure ports and paths between secondary systems
1.
Create a command device in each of the secondary systems.
2.
Configure external ports on the secondary system to be used as the supervisor DKC.
3.
Configure paths between the external ports on the supervisor DKC and the target ports on the
subordinate DKCs. In the example in
, secondary system 1 has external
ports, each of which is connected with a target port on the secondary systems 2 and 3.
For information about supervisor and subordinate DKCs, see the bullet on “arbitration
processing” in
“Planning Cnt Ac-J Z in multiple XP7s using a consistency group” (page 32)
.
For more information about external ports, see HP XP7 External Storage for Open and
Mainframe Systems User Guide.
For details on configuring paths, see HP XP7 Provisioning for Mainframe Systems User Guide.
4.
Create mapping between command devices in the supervisor DKC and the subordinate
DKCs.
shows an example. The supervisor DKC must be able to use command
devices in subordinate DKCs via remote command devices.
In the example, command devices A and B are created in the subordinate DKCs on secondary
systems 2 and 3. Remote command devices are created on the supervisor DKC in secondary
system 1 and are mapped to the subordinate DKCs. The emulation type of command devices
and remote command devices must be OPEN-V.
For more information about remote command devices, see HP XP7 External Storage for Open
and Mainframe Systems User Guide.
Figure 4 Connections between Supervisor, Subordinate DKCs
34
Planning volumes, XP7 systems