Apple Xserve RAID upped to 5.6 terabytes (MacCentral) MacCentral - Apple on Tuesday announced that its Xserve RAID storage system is now available with up to 5.6 terabytes (TB) of storage capacity -- up from 3.5TB in previous models. Apple has also received certification for the Xserve RAID from Cisco and SUSE Linux, and has optimized the RAID system to work with Apple's own Xsan Storage Area Network (SAN) file system.