We used memcache as a session storage server because we needed to balance load across servers and share session data. Persistent file storage is not usable, and since memcache session storage is easy to configure in PHP, so we have decided to use it.
Before this, memcache maximum storage was set to 64 MB, the data went up to 54 MB and so we thought it was the cause of cache misses. But after we increased to 256 MB, the problem is still occurring. Users report that after they logged in, they click on another page and they get logged out. But after a refresh they appear logged in again. session.gc_maxlifetime 1440 1440
