If your Company Operation has committed for an stringent SLA with client, it doesn’t mean that you need to add more buffer or backup to your staff or connectivity just to compensate it. You might need to consider also the “smaller things” like additional module card for your critical devices, hard drive, memory and many more. Why we said this? Because these things can be consider a part of the bigger picture of an outage. Come to think of it if your critical server only has one power supply and encountered hardware failure what will happen to your operation staff who highly depend on this service or let’s say that physical server acting as Virtualize environment of your production servers. Where you gonna buy equipment part in the middle of the night?