Storage System Preparation; Cache, Additional Control Memory Requirements - Hitachi G200 User Manual

Storage system preparation

The following preparations are required for the storage systems in a
TrueCopy pair relationship.
• Device Manager - Storage Navigator must be LAN-attached to the primary
and secondary systems. See the Hitachi Command Suite User Guide for
information.
• The primary and secondary systems must be set up for TrueCopy
operations. See
3-2. Make sure to consider the amount of Cache Residency Manager data
that will be stored in cache when determining the amount of cache for
TrueCopy operations.
• Make sure that each of the primary and secondary storage systems is
configured to report sense information to the host. If the storage system
cannot be attached to any host, connect the secondary storage system
with the host for the primary storage system.
• If power sequence control cables are used, set the power select switch for
the cluster to LOCAL to prevent the primary system from being powered
off by the host. Make sure the S-VOL is not powered off during TrueCopy
operations.
• Install the data path between the primary and secondary systems.
Distribute data paths between different storage clusters and extenders or
switches to provide maximum flexibility and availability. The remote paths
between the primary and secondary systems must be different than the
remote paths between the host and secondary system. See
requirements and configurations on page 3-25

Cache, additional control memory requirements

Cache must be operable for the pair's primary and secondary systems. If not,
pairs cannot be created. The secondary system cache should be configured to
adequately support TrueCopy remote copy workloads and any local workload
activity.
• Hitachi Virtual Storage Platform G200:
There are three types of control memory: Basic, Extention1, and
Extention2. Only Basic control memory can be used with TrueCopy
running on VSP G200. Adding control memory expands the capacity of
the pairs to be created.
• VSP G400, G600, G800 and VSP F400, F600, F800:
Additional control memory is a prerequisite in both the primary and
secondary systems to use TrueCopy on VSP G400, G600, G800 and VSP
F400, F600, F800 storage systems.
For information on adding control memory and setting the TC-dedicated area,
contact Hitachi Data Systems customer support.
Note: Neither cache nor control memory can be added to or removed from
the storage system when pair status is COPY. When either of these tasks is to
3-2
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
Cache, additional control memory requirements on page
Planning for TrueCopy
Data path
for more information.