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

Remote Copy Set Features
38 Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
■ If FAIL_ALL is set, and if one member assumes the failsafe locked condition, then all
members of the association set assume the failsafe locked condition.
■ Association sets reside on the initiator dual controller, as illustrated in Figure 11.
Figure 11: Location of association sets on the initiator dual controller
FAIL_ALL Switch
Because all copy sets within an association set are moved as a unit during failover and
failback, all remote copy sets within an association set must be owned by the same server.
If the FAIL_ALL switch is enabled and one member of the association set assumes the
failsafe locked condition, all members of the association set assume the failsafe locked
condition. The failsafe locked condition prevents further host access.
Note: This applies only to remote copy sets with failsafe error mode enabled. Failsafe error mode
is enabled through the ERROR_MODE switch of the SET RemoteCopySets command.
When NOFAIL_ALL is specified, the members of the association set react independently to
failsafe locked conditions. One member of the association set becoming failsafe locked has no
effect on the other members of the association set. NOFAIL_ALL is the default setting.
The NOFAIL_ALL switch has no effect if all members of the association set have failsafe
locked error mode disabled (normal error mode) or if there is only one remote copy set in the
association.
All members of an association set must be on the same controller, to enforce cache coherency.
When members are added to an association set, they are moved to reside on the same
controller; they fail over together.
Association set members can be either synchronous or asynchronous. This allows for grouping
only those members that use the same write history log unit.
Unit Unit
INITIATOR
Association
Set 1
TARGET
Unit Unit
CXO7069C
Remote
Copy
Set 1
Remote
Copy
Set 2