Stacking is better than trunking.  Less overhead, lower latency, higher throughput.   Also make sure you have latest firmware for the 6224.  If using Jumbo Frames move the iSCSI ports to their own VLAN.  (Server and EQL array ports).   Set MTU size to 9216. 
hi there, I was wondering if dell consider it best practise to stack iscsi switches (e.g. 6224) or to keep them separate with aggregated uplinks. Chers, Huw
should I stack switches