3PAR Remote Copy 2.3.1 User's Guide (320-200175 Rev A, October 2009)

2.42
Requirements and Restrictions
Remote Copy User’s Guide InForm OS Version 2.3.1
Systems used by Remote Copy must adhere to the following restrictions:
■ All storage servers in the configuration must be configured at the same InForm OS level.
■ Each storage server is limited to two Remote Copy interfaces.
This limitation does not apply to 1-to-N Remote Copy. For 1-to-N Remote Copy, the primary
storage server can have four RCIP interfaces; two to one secondary system and two to the
other secondary system.
■ RCFC over IP networks is only allowed for Remote Copy in asynchronous periodic mode.
In addition, the following general restrictions apply to the use of Remote Copy:
■ Self-mirroring configurations are not supported. In other words, a storage server cannot be
used to replicate its own primary volumes.
■ Multihop configurations are not supported. In other words, a primary volume group
cannot be replicated to a backup system and then replicated again from the backup system
to a third storage server.
■ Under normal operating conditions, one system can only be the primary server for one
other system.
This limitation applies mainly to N-to-1, 1-to-N, and bidirectional configurations. See N-to-1
Restrictions on page 2.43 and 1-to-N Restrictions on page 2.44 for additional details. An
exception to this rule is granted for situations where targets must be reversed during
disaster recovery.
■ All volumes used with Remote Copy must be Thinly Provisioned Virtual Volumes (TPVVs)
with snapshot space or fully provisioned virtual volumes. In addition, the following
restrictions apply:
◆ The maximum number of mirrored volumes system-wide in synchronous mode is 800.
◆ The maximum number of mirrored volumes system-wide in asynchronous periodic mode
is 2400.
◆ The maximum number of volumes per Remote Copy group in synchronous and
asynchronous periodic mode is 100.
◆ The maximum number of volumes per Remote Copy group in asynchronous periodic
mode is 2400.
◆ The maximum size of a mirrored volume is 16 TB.