Redundant I/O Queue De-allocation in Multi-site Storage

The system dynamically adjusts I/O queue configuration based on operational state. During normal operation, queues are maintained at both primary and backup systems for redundancy. Upon detecting primary system failure, the system dynamically reconfigures to activate backup queues, eliminating the need to permanently maintain duplicate queue structures and their associated resource overhead.

Instead of maintaining full functional copies of I/O queues at the backup system, the invention uses queue information copying and registration mechanisms. The backup system receives and stores queue registration information from the primary system, allowing it to assume queue processing roles only when needed, rather than continuously maintaining active queue structures.

The backup system performs preliminary actions by receiving and storing queue registration information from the primary system in advance. This allows the backup system to have queue metadata available before actual queue activation is needed, so that when failover occurs, memory resources can be rapidly allocated without wasting resources on continuous maintenance of full queue structures.

The system implements dynamic memory allocation where backup queues are allocated only when needed (upon primary system failure detection). When the primary system is operational, the backup system discards or deallocates memory resources associated with redundant queue structures, recovering those resources for other uses while maintaining the ability to quickly reactivate queues when needed.