The F400Q multiprotocol system is specially designed for high availability applications and featured with Fibre Channel and iSCSI ports in each controller. The iSCSI ports can be activated for Qsan’s system built-in remote replication function – QReplica or used for widely approved iSCSI functions. The unique multiprotocol feature allows users to integrate the applications and data from the FC and IP networks in the same F400Q storage system without extra infrastructure cost. The F400Q is well equipped with fully redundant components for all major functions, including redundant RAID controllers, power supplies, fan modules, battery backup modules, and SAS JBOD expansion ports. Being hot pluggable, all of them provide non-stop services. In addition, the firmware is high available as well, including RAID 6, 60 support, QSnap writable snapshot, Windows VSS support, QReplica remote replication, and volume configuration restoration; all of these are provided to reduce the chance of rebooting or shutdown. Distinct from others, the F400Q is able to upgrade firmware without system down time. Both firmware image and volume handling are well protected by the redundant RAID controllers; when one RAID controller is down or has lost the connection, the other RAID controller takes over its tasks immediately. The volumes and the services are transferred seamlessly simultaneously.