Auto disk spin down Advanced cooling mechanism 80 PLUS energy-efficient power supplies Hardware iSCSI off-load engine iSCSI jumbo frame Header/Data digest CHAP authentication Up to 32 multiple nodes support Up to 128 sessions per controller RAID level 0,1,0+1,3,5,6,10,30,50, 60, JBOD, N-way mirror Up to 1024 logical volumes Up to 32 hard drives per volume group One logic volume can be shared by as many as 16 hosts Global and dedicated hot spare Write-through or write-back cache policy Online volume expansio