HP StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide (AA-RPHZF-TE, March 2004)

Remote Copy Set Features
43Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
Unplanned Failover
An unplanned failover does not allow for an orderly shutdown of controllers. An unplanned
failover is initiated when any of the following occurs:
■ The initiator site is lost.
■ There is no host access.
■ There is no access to both initiator controllers.
Note: If both links are severed and the initiator configuration is functional, the system administrator
must determine which site to use as the primary site.
Failback
The failback method (full copy or fast-failback) is determined by the enabling of logging or
failsafe switches, the selected operation mode, and whether the failover is planned or
unplanned, as specified in Table 4. This table also shows the availability of the association set
switches, ORDER_ALL and FAIL_ALL.
For more detail on failover and failback, refer to the HP StorageWorks Data Replication
Manager HSG80 Version 8.7P Failover/Failback Procedures Guide.