Filesystem vs Memcached adapters for Zend Cache state management

Cache Backend Selection for High-Traffic State

When managing application state in a high-traffic environment using Zend Cache, the choice of backend adapter directly impacts I/O performance and scalability. The Filesystem adapter provides persistence across service restarts but introduces potential file-locking contention and disk I/O overhead.

In contrast, the Memcached adapter offers high-speed volatile storage suitable for distributed horizontal scaling, though it requires maintaining a separate daemon and lacks native persistence.

For a deployment where minimizing latency is critical but infrastructure complexity must remain low, the trade-off between local disk I/O and external memory daemon management becomes a primary design constraint.

• Does the Filesystem adapter's locking mechanism introduce significant bottlenecks under high concurrent write loads?
• Under what specific traffic thresholds does the overhead of a Memcached daemon outweigh the I/O latency of the Filesystem adapter?