HP StorageWorks XP Remote Web Console Software - Manual (Page 59)

Universal Replicator for Mainframe does not allow the secondary data volume to be online (except
while the pair is split). If the secondary data volume is online, the Universal Replicator for Mainframe
add pair operation will fail.
CAUTION: If the Universal Replicator for Mainframe secondary data volumes are physically
attached to the same host server(s) as the Universal Replicator for Mainframe primary data volumes,
the following problem can occur:
When a Universal Replicator for Mainframe pair is released, the old secondary data volume is
usually offline. If the host is then restarted, the system administrator may be offered both volumes
and asked which volume should be left offline. This can be confusing and is prone to error.
If the Universal Replicator for Mainframe secondary data volumes and primary data volumes are
connected to the same host(s), HP strongly recommends that the secondary data volumes are
defined to remain offline to avoid this problem.
Installing the Hardware
The initial installation of the Universal Replicator for Mainframe hardware is performed by the user
and the HP representative. To install the hardware required for Universal Replicator for Mainframe
operations:
1. User: Identify the locations of the Universal Replicator for Mainframe primary and secondary
data volumes (primary data volumes and secondary data volumes), so that the Universal
Replicator for Mainframe hardware can be installed and configured properly.
2. User and HP Representative: Make sure that the primary storage system(s) and secondary
storage system(s) are configured for Remote Web Console operations (for example, SVP
connected to LAN). See the HP XP24000/XP20000 Remote Web Console User's Guide for
information and instructions on setting up Remote Web Console operations.
3. HP Representative: Make sure that the primary storage systems and secondary storage systems
are properly configured for Universal Replicator for Mainframe operations (for example,
cache, NVS) (see
“Cache and Nonvolatile Storage ” (page 58) . Make sure that the desired
system option modes are enabled (see “Metadata Information” (page 30) ). Make sure that
adequate cache is installed and available for Universal Replicator for Mainframe operations.
You must also consider the amount of Cache Residency Manager data to be stored in cache
when determining the required amount of cache.
4. HP Representative: Make sure the primary storage systems are configured to report sense
information to the host(s). The secondary storage systems should also be attached to a host
server to enable reporting of sense information in case of a problem with a secondary data
volume or secondary storage system. If the remote site is unattended, the secondary storage
systems should be attached to a host server at the primary site, so that the system administrator
can monitor the operational condition of the secondary storage systems.
5. HP Representative: If power sequence control cables are used, set the power select switch for
the cluster to LOCAL to prevent the primary storage system from being powered off by the
host. Also make sure the secondary storage system will not be powered off during Universal
Replicator for Mainframe operations. See
“Setting up Remote Copy Connections” (page 60)
for further information on powering off/on the primary storage systems and secondary storage
systems.
6. HP Representative: Install the Universal Replicator for Mainframe remote copy connections
between the primary storage system(s) and secondary storage system(s). This hardware (optical
fibre cables, switches, and so on) is supplied by the user.
See “Setting up Remote Copy Connections” (page 60) for remote copy configurations. Distribute
the paths between different storage clusters and switches to provide maximum flexibility and
availability. The logical paths between the primary storage system and secondary storage
system must be separate from the logical paths between the host and secondary storage
system.
Installing the Hardware 59