The IR16IS4 16 bay SATA II or SAS to iSCSI RAID offers storage of up to 32.0TB. Units are standard with 4 1Gb iSCSI ethernet hosts, 1GB memory cache (upgradeable to 2GB), & redundant fans and power supplies. 16 1.5TB SATA II drives installed. RAID0, 1, 0+1, 3, 5, 6, 10, 30, 50, 60 and JBOD supported, with up to 1024 logical volumes. Available with battery backup. Standard 3 year warranty. Designed for Windows, Mac, Linux. Advanced GUI for easy maintenance and monitoring. Fully modularized design allows quick parts replacement for high availability. Qsnap built-in snapshot with rollback enabled. Snapshot enabled up to 16 volumes, each logical volume supports up to 32 snapshot volumes, total 512 snapshot volumes per controller. VMWare compatible. Expandable to 96 drives with optional JBOD expansion units.