Minimum hardware for private cloud

I am in a  colo in houston.  I want to offer private cloud to peeps.  I'm thinking that starting off with two ESXi hosts, one SAN and tape BU will be a good start.  So, I know that a lot of this is opinion, but give me some thoughts on your idea of minimum hardware for private cloud offerings for say a couple of mail servers for small offices (<20 users) and maybe a file server or two.

Thanks

Cliff

PS:  Let's assume my power, redundant internet pipes and etc is all good, because it is.
crp0499CEOAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
That looks like a good start, but you may want to re-consider Tape Backup, because ESXi does not support the connecting of a tape drive to the servers.

Most VMware Admins now use storage or disk backup.

other Backup Products to consider also

AppAssure
http://www.appassure.com/ - Number 1 Backup and VMs and Cloud

Unitrends
http://www.unitrends.com/ - a good vRecovery Backup Appliance.

Symantec Backup Exec V-Ray Edition
http://www.symantec.com/backup-exec-vray-edition - Unmatched backup and recovery designed for virtual and physical environments

VM Explorer
http://www.trilead.com/ - Simply, cost effective and it works.

Acronis Backup & Recovery® 11 Virtual Edition
http://www.acronis.com/virtualization/ - simple but effective

StorageCraft ShadowProtect Server
http://www.storagecraft.com/  - amazing but can be expensive


NAKIVO Backup & Replication for VMware
http://www.nakivo.com/ - current testing proves very postiive

vBackup - in Beta
http://www.thinware.net/Products/vBackup/tabid/202/Default.aspx
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