Each file server rack can have from four to twelve HP E-utilica file server systems. LUN stands for Logical Unit Number. LUN security is built into the HP xp disk arrays. Futhermore, each file-server is connected to the xp disk array through a Brocade 2800 fibre channel switch that uses zoning to segregate file servers. The HP xp storage configuration supports RAID levels 0,1, and 5.
High availability is accomplished through battery-protected and mirrored write cache.
Each HP E-utilica file server system maintains a primary and an alternate connection to the switches.