Understanding Business Continuity Manager Functions; Remote Dkc Control Function - HP XP P9500 Software User's Manual

3 Understanding Business Continuity Manager functions

This chapter describes Business Continuity Manager functions.

Remote DKC Control Function

A host with the Remote DKC Control Function can control storage systems that are not directly
connected via a channel (for example, because they are on remote sites).
The Remote DKC Control Function uses connection paths (FC-Links) between storage systems in
order to control Business Copy for Mainframe, Continuous Access Synchronous for Mainframe,
Continuous Access Asynchronous for Mainframe, and Continuous Access Journal for Mainframe
running on the storage systems that are not directly connected to the host via a channel. By
controlling these copy types, you can perform copy group operations and acquire the statuses of
copy groups.
other sites by using the Remote DKC Control Function. In this figure, Business Continuity Manager
on the primary and secondary sites uses a command device to control Business Copy for Mainframe
copy groups used on the other site.
configuration that has two forward-direction routes starting from the primary site.
The following paragraphs and figures explain the terminology associated with the Remote DKC
Control Function. See
Remote Disk Controller - A storage system that is not directly connected to a host via a channel.
As shown in
storage system is the storage system whose serial number is 15001. From the perspective of
the secondary site, the remote storage system is the storage system whose serial number is
14001.
Command Device - A volume that is used to control a remote storage system and that sends
copy group operation commands to a command device in the remote storage system. A
command device is also required when you use the Continuous Access Synchronous for
Mainframe consistency preservation function. A command device supports unidirectional
communication only.
Route - The path that the command device uses to send copy group operation commands to
a remote storage system.
Route List - The connections and relationships among the command devices defined in each
storage system. The route list is used by Business Continuity Manager to determine the route
used when executing copy group operation commands.
Entry - A storage system or command device defined on a route. In
are two entries for each route.
APID – An ID used for communication between command devices.
If the routes are in the same direction and used on the same host, all of them have the same
APID.
In Figure 41 (page
same APID, 0001.
To establish a reverse-direction route from the secondary site, assign a value different from
the ID used for the forward-direction APID.
To establish a reverse-direction route from the secondary site, assign a value different from
the ID used for the forward-direction APID.
Figure 40 (page 76) shows how to perform operations on copy groups on one more
Figure 40 (page 76)
Figure 40 (page 76), starting from the perspective of the primary site, the remote
77), the route starting from CD1 and the route starting from CD3 have the
Figure 41 (page 77) shows the concept of APID in a
and Figure 41 (page 77).
Figure 41 (page
Remote DKC Control Function
77), there
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