The HP StoreVirtual 4000 is a series of products based on the LeftHand Networks technology acquired in 2008. The StoreVirtual 4130 and 4330 models allow a single node per SAN and can be SAN attached using iSCSI over Ethernet. The 4330FC model is connected by Fibre Channel. The 4530 and 4730 are IP- based storage systems using iSCSI with server-based nodes and attached storage. The 4630 BladeSystem SAN uses blades in a C7000 enclosure with management from BladeSystem Infrastructure tools. HP has introduced sub-LUN tiering called Adaptive Optimization with the 4335 Hybrid Storage system. With support for SSDs and HDDs, the 4335 can auto-tier at the sub-LUN level with 256KB granularity.