There are times you are absolutely unavailable (sick, on a plane, off grid, dealing with a personal emergency, etc). What's your strategy when all hell breaks loose and you just can't step away.
In other words, being on call 24-7-365 is not realistic. Do you have a plan?
- disk fails (ZFS with hot spares)
- power supply fails (each server has two)
- someone cut the power (there's another server)
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Most issues will be caused by me, so the general answer is don't leave before testing.
Until then it's apparently not a huge problem.