From eaccelerator.ini file:
; The directory that is used for disk cache. eAccelerator stores precompiled
; code, session data, content and user entries here. The same data can be
; stored in shared memory also (for more quick access). Default value is
eaccelerator.cache_dir = "/var/cache/php-eaccelerator"
Directory /var/cache/php-eaccelerator should exist in CageFS, otherwise eAccelerator may fail.