HP XP P9500 Storage - Manual (Page 13)

Hitachi Dynamic Link Manager manages I/Os through a disk driver. Raw I/O is not supported.
For version information, contact your HP representative.
Primary and secondary systems requirements
•
Make sure that the primary system, the secondary system, and external storage systems have
their own independent sources of power.
•
The ESAM P-VOL and S-VOL must be located in different storage systems.
•
Primary and secondary systems each require two initiator ports and two RCU target ports.
The initiator port sends ESAM commands to the paired storage system. Initiator ports must
be configured on the primary system for ESAM operations. However, for disaster recovery,
you should also configure initiator ports on the secondary system. ◦
◦ RCU Target port receives ESAM commands and data. RCU target ports must be configured
on the secondary system for ESAM operations. You should also configure RCU target
ports on the secondary system for disaster recovery.
Additional microprocessors for replication links may be required based on replication workload.
•
If you use switches, prepare them for both the primary and the secondary systems. Do not
share a switch between the two. Using two independent switches provides redundancy in the
event of failure in one.
•
Secondary system cache should be configured to support remote copy workloads, as well as
any local workload activity.
•
Cache and non-volatile storage (NVS) must be operable for both the MCU and RCU. If not,
the ESAM Paircreate operation will fail.
•
The required program products for ESAM operations must be installed.
Licenses
The following HP software products must be installed on both the primary and secondary systems.
Each product each requires a license key. See the HP P9000 Remote Web Console User Guide
for installation instructions.
•
External Storage Access Manager
•
Continuous Access Synchronous
•
External Storage
License capacity
A single ESAM license must be purchased for each P9500 system. The ESAM license is not capacity
based. The capacity of the Continuous Access Synchronous license determines the capacity of
ESAM volumes that may be replicated. Review the Continuous Access Synchronous license installed
on your system to verify that it meets your requirements.
For example, when the license capacity for Continuous Access Synchronous is 10GB, the volume
capacity that can be used for ESAM is up to 10GB. When 2GB out of 10GB of license capacity
for Continuous Access Synchronous is used, the volume capacity that can be used for ESAM is up
to the remaining 8GB.
See the HP P9000 Remote Web Console User Guide for information on licenses and the actions
to take for expired licenses and exceeded capacity.
Pair volume requirements
Data in the P-VOL on the primary system is copied to the S-VOL on the secondary system. These
two volumes are a pair.
Primary and secondary systems requirements 13