Additional information on pair status
When a pair is split by the user or suspended by the system, the primary system notifies the hosts with a service information message (SIM). If SNMP is installed and operational for Virtual Storage Platform G200, G400, G600, this SIM results in an SNMP trap that indicates the reason for suspension.
Transitional states occur when a request is accepted to change pair status to PSUS, PSUE, or to delete the pair, but is not yet complete. Transition states are not reported to the host.
The user or the primary or secondary systems can initiate the PSUS/PSUE status change.
Only the user can delete a pair.
When you perform an operation, the system reports final status at the end of the operation.
If an error causes the status to change to PSUE, the status is reported at the beginning of the transition.
When the pair status is COPY, neither cache nor shared memory can be added to or removed from the system. If you need to perform either of these tasks, split the pairs with COPY status, and then resynchronize the pairs when the cache or shared memory operation is completed.