Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide

2–6 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Error Mode
SET RemoteCopySetName ERROR_MODE=FAILSAFE or NORMAL.
The FAILSAFE ERROR MODE causes a remote copy set to become failsafe locked if the
target becomes inaccessible or the initiator unit fails. When failsafe locked, the remote
copy set is inaccessible.
If a dual link failure occurs, the target is not removed, but is marked invalid. When the
target is accessible again, a full copy operation is started. When completed, the failsafe
locked condition is cleared.
If the error mode switch is set to NORMAL, write operations are allowed to continue even
when a dual link or disk error is present. NORMAL is the default setting.
IMPORTANT: You cannot enable the failsafe switch with write history logging enabled.
Association Sets
An association set is a group of remote copy sets that share common attributes. Members
of an association set can be configured to transition to the same state at the same time. For
example, if one association set member assumes the failsafe locked condition, all other
members of the same association set assume the failsafe locked condition.
An association set may also be used to simply share a log between a group of remote copy
set members that require efficient use of the log space.
Association Set characteristics
■ Up to 12 remote copy sets as members
■ Synchronous or asynchronous operation mode and members may be set differently
■ If ORDER_ALL is set, requires in order execution of commands across the remote
copy sets in the association set.
■ Can share a log unit
■ If FAIL_ALL is set, all members of the association set assume the failsafe locked
condition if one member assumes the failsafe locked condition.
■ Reside on the initiator controller pair