Software Manual

2.22
Remote Copy Operation
Remote Copy User’s Guide InForm OS Version 2.3.1
For unidirectional Remote Copy, each virtual volume in a Remote Copy group on the primary
server is mapped to a virtual volume in a corresponding secondary group on the backup
storage server (Figure 2-12).
Figure 2-12. Mapping of Volumes Between Primary and Backup Storage Server
In both cases, any primary volume can be mapped to any secondary volume that belongs to the
corresponding Remote Copy group on the target system, with the restriction that the
secondary volume be the same size as the primary volume.
2.9.1 Volume Group Modes
There are two modes used by Remote Copy volume groups: synchronous and asynchronous
periodic.
■ Synchronous mode volume groups stay synchronized at all times. See Synchronous Mode on
page 2.23 for a detailed description of this Remote Copy mode.
■ Asynchronous periodic mode volume groups undergo resynchronization periodically, either
at a scheduled interval or when resynchronization is manually initiated. For a detailed
description of this Remote Copy mode, see Asynchronous Periodic Mode on page 2.24.
Volume Group
Volume Group
(Primary)
(Backup)
(Primary)
(Secondary)
InServ1
InServ2
A
A
B
B
C
C
Target: InServ2
InServ1
Target: InServ1
InServ2
Direction of data
replication
NOTE: All volumes used with Remote Copy must be Thinly Provisioned Virtual
Volumes (TPVVs) with snapshot space., or fully provisioned virtual volumes as
discussed in Remote Copy and Thin Provisioning on page 2.33. However, snapshot
volumes in Remote Copy groups are not supported.