Have I ever worked on vacation - I have called into a teleconference or checked my voicemails. But I avoid it at all costs. Some things I delegate up to my boss, some things I delegate down to my staff. The week before vacation is often the busiest all year as I clear my desk.
Did you explain the sitauation to your boss? I would be horrified to make you work when something like that was on. I would have looked for creative ways to deal with it.
I try to get my staff able to understand some of each others knowledge domaines to the extent of being able to cover for each other. One of my staff was away for three weeks this summer, and I took over most of his projects. I did call him once for a piece of information. For the rest, I just managed and coped my way through it.
I attend the funerals of my staff's loved ones(family). So I wouldn't dare call them. I wouldn't ask them to carry a phone or a pager. That would the height of crassness.
If I may be so bold, if your manager doesn't see that dependancy on one individual is a bit of a problem, then he/she is a poor manager.
I did work on a high profile project about 10 years ago. We were all on pager duty for a year. We had a problem on Christmas day and one of the individuals was called on Christmas morning. He didn't have kids but had taken time off to get away with his girlfriend, who threatened to break up with him if they didn't spend some quality time together. He didn't leave a forwarding number and his cell was off. The senior manager called all the hotels in the city he was staying at to find him. Needless to say, the risks to the project were high if he did contact him (lose a valuable resource) and high if he didn't (customer lost connectivity in a 24/7 business).
If I found myself with two days to go before a deadline and a vacation day coming up, and I knew I couldn't make it, I'd talk to my boss about it. Some deadlines are more important than others.
James