In the past ATLAS used /common primarily for their software installations but with cvmfs (see below) this is no longer necessary. ATLAS users also have made personal directories under /common/atlas. However, this is not the intended use of /common, as described on Other File Systems, and should not be continued.
/eliza1, /eliza2, eliza4, /eliza18
ATLAS has space on 4 elizas: 35TB on /eliza1, 35TB on /eliza2, 12TB on /eliza4 and 142TB on /eliza18. The space on all is used both for production data as well as for the work of individuals. The directories for individuals are located under /eliza[1,2,4,18]/dayabay.
ATLAS does not have a directory under /project/projectdirs.
CVMFS is the Cern Virtual Machine File System and it is installed on all PDSF nodes for ATLAS users. It is a network file system based on HTTP and optimized to deliver experiment software in a fast, scalable and reliable way. Files and file metadata are aggressively cached and downloaded on demand. For more information see the CernVM-FS webpages.