I'm getting my feet wet on the concept of virtualization at our main data center (30 servers, not a heavy workload) and our colo (just a few servers, low usage). While our needs are relatively simple, in that we have 30 full time system users and 40 terminal server users, and an I/O analysis has shown that we are not hitting our systems very hard, our business model is moving from the commercial sector to the residential sector and uptime, availability and dr is becoming more important. Also, we require more flexibility than is allowed by individual physical hosts, which sometimes are only serving a handful of users for a fraction of the day.
I could use some guidance on whether an equilogic appliance, or the like, would be overkill for us. Dell is pushing pretty hard for us to go that route and I'm hesitant to recommend to our corporate principals that we spend the money, even though system uptime and redundancy has been named as high priority. On the other side, it has been suggested that we just create an iscsi connection from a physical host to a LUN on a netgear/NAS device and use those volumes for virtual hosts. Is this scenario too simple and setting us up for too many single points of failure? Is there a practical difference between a NAS and a Dell Powervault?
Lastly, I received information today that is making the project more urgent which in turn makes the factors of ease of setup and administration for an admin new to virtualization more important. If you have any thoughts on this in regards to hardware and software options, i would appreciate it.
I know these are general questions, but I tried to give you as much information as I could without writing a book. Thanks in advance.