We just decommissioned a pair of EMC CX's. These things had phone home to EMC (and then eventually a third party maintainer) if something was about to go bad or

We just decommissioned a pair of EMC CX's. These things had phone home to EMC (and then eventually a third party maintainer) if something was about to go bad or had failed. We'd usually have an engineer onsite within four hours at the DC with all the right parts to carry out a fix. By the time it was being looked after by the third party maintainer they'd just leave us a few disks and a couple of fibre channel controllers onsite and we'd get the DC remote hands to swap them out. The faulty parts were then boxed up and couriered back to the maintenance company all on their dime. There was not an awful lot of involvement on our end except for authorising access to the DC when an engineer needed to attend. None of this was massively expensive (and this was 24x7x365 cover) in the great scheme of things given their mission critical status.