I'm finishing off a Terminal Services solution where I have two identical Dell PowerEdge R710 servers running Hyper-V which will both be connected to a Dell MD3000 DAS via SAS HBA. The MD3000 will host several virtual terminal servers.
The question is: what would be a good disk configuration for the MD3000 DAS?
These terminal server images (min of 4, max of 6) will be used by a relatively small number of people (approx. 20). Usage mainly revolves around using our custom .NET data-entry apps, MS Office (email, word, excel, ppt), browser usage, etc. Fairly low usage and 99% of all user data is stored on a separate file server.
I believe more fault tolerance is needed than RAID 5 can provide. I would like the ability to absorb at least 2 disk failures. I plan on purchasing backup hdd's to quickly hot-swap in in the event of disk failure.
The notable options are RAID's 1 / 6 / 10 / 15. Please feel free to contribute outside of these margins.
In accordance with Serverfault posting rules, please state your suggestion accompanied by solid reasoning and/or factual evidence and steer clear of personal opinions. Examples of configurations you have built or worked with would also be worthwhile to mention.