I'll outline the last VMware system I built for my former employer... working as a contractor now and about to quote on a similar rig, but probably with IBM servers and NetApp storage. - Number of users: ~300 - Number of offices and location: Offices in SYD, MEL and an office and two data centres in BNE - Number of physical servers before virtualisation: 30ish, had about 80 VMs when I left. - Major applications/systems: Mostly MS stuff, trading systems, SQL, Web, F&P, D&RMS, Citrix. Only stuff not virtual is a Domain Controller in each DC, VCB and the Backup Server attached to the autoloader - Reason for virtualisation: Several - DR, ease of management, limited rack space in hosting - Outline of Server infrastructure: Two DCs and head office connected via a triangle of dark fibre for FC and Ethernet. Each DC with- EMC CX3-20 array with three shelves of FC drives and a shelf of SATA for backup to disk, etc 4x Dell 2950s - 2x73GB boot, 32GB RAM, dual port FC HBAs, Quad Intel 1GB NICs 2x McData 4GB FC switches Cisco 3750G stacks links to ISP, etc, symmetrical across both DCs with a /24 from APNIC VRRP'd internet routers and Checkpoint on Crossbeam C6's clustered across DCs - Outline of Network infrastructure: Both DCs run 'hot' with the load split evenly across both. LUNs for the VMs nominaly hosted at each DC replicated to the other DC. VLANs trunked across both DCs with VRRP so that the switch in the remaining DC would take over as the default GW for each subnet in a failure. In a 'whole DC' failure all that needs to be done is mount the replica LUNs on the cluster at the other DC, fiddle with "DisallowSnapshotLUN" and boot the VMs. I implemented VCB 1.0 on this, so one DC has a dedicated VCB box with internal storage to do snapshot backups into Legato. VCB 1.1 would have made this a lot easier. Each DC also has a physical domain controller to look after basic stuff like DHCP, time sync, DNS and logons. Virtualising this stuff causes lots of chicken and egg problems that I'd rather not deal with in a disaster. Suffice to say that I think it’s a damn sweet setup. I <3 VMware, EMC Clariion, and 3750s.