SHMEM

Shmem is the shared memory functionality that is used by some systems like databases and others, is not needed to use ANDRAX but if you want use a system that need shmem you will like to enable it, one of these systems are postgresql the Metasploit database program.

ANDRAX Kernel SHMEM

You need enable the option Use full shmem filesystem that is located at: General Setup -> Configure standard kernel features (expert users) the path can change a bit but the category names ever will be likely these ones.