Equallogic is active/standby (only 1 controller is online at any given time). Minimum replication time is 5 minutes, unless you go synchronous replication, but this shouldn't be used over long distances (higher latency networks). Equallogic is iSCSI only. For iSCSI the 1Gbit units are all RJ45 ports. The 10Gbit units have both RJ45 ports and SFP+ ports. You can connect both, but only 1 port is used at a time (not sure how the new PS6210 does SFP+ and RJ45 failover as it has 2 of each on each controller). Equallogic does indeed support snapshots. With the Host Integration Toolkits (available for Windows, VMware and Linux (some limitations on new OS versions (mainly Windows 2012 R2 and RHEL 6.3 and later aren't supported at this exact time (2014-01-22))) you can use so-called smart-copies. These quiesce IO to the volume before telling the array to take the snapshot. The Microsoft HITKIT supports SQL, Exchange, Hyper-V and I think Sharepoint. I have personally only used the HITKIT with Hyper-V, but in Hyper-V it allows rolling back a single VM on a volume even if there are multiple on the volume in question.
I am new to the product, and we are in the process of evaluating. Following are inquiries. I hope you can help me out:1. Does it support active/active or active/passive controllers?2. what is minimum replication RTO time in Async mode? Minimum data lost I can define?3. Supported Technology:Hybrid, SSD, FC, SAS, SATA, 10 GBe?4. Data protection / snapshot is supported? Those questions are about DELL NAS products, please forgive me if I have chosen a wrong TAGS. 
New to the product, and need to know basics. Please help