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

4.2
Management
Remote Copy User’s Guide InForm OS Version 2.3.1
4.1 Management
Use the showrcopy command to display information about the system’s configuration and the
statrcopy command to display link throughput statistics. See Appendix B, Remote Copy
Commands for complete instructions on using these commands.
4.2 Reversing Target Designations
If you experience problems with the server or volume group that is designated as the primary
system, the volume group targets can be reversed to enable a volume export. While it is
possible to export secondary volumes at any point, these volumes will be read-only. If the
primary server fails and the backup server needs to be used to export read-write volumes, you
must first reverse the targets using the
setrcopygroup command.
Reversing server designations is required for disaster recovery, as illustrated in Appendix C,
Example Setup and Disaster Recovery.
■ To enable I/O to the secondary groups for a target, issue the setrcopygroup failover
-t <target_name>
command on the system with secondary groups. See Appendix B,
Remote Copy Commands for detailed information about this command.
This command reverses the direction of all secondary groups for the designated target thus
allowing the volumes to become primary.
■ To reverse the primary and backup designations for a single volume group, use the
setrcopygroup failover <group_name>
command.
NOTE: When issuing commands that are mirrored from one system to another,
there is a five minute timeout limit. After five minutes, if the other system does
not respond to a command, the following error message appears:
target system <target_name> could not be contacted
NOTE: See Appendix C, Example Setup and Disaster Recovery for more
information on reversing server designations, including examples of full disaster
recovery cycles for unidirectional and bidirectional Remote Copy pairs.