Not UNIX but VMS. At an old job, we had a central VAX server running VMS. It had an uptime of almost 6 years. I was there when they had to reboot it and it was

Not UNIX but VMS. At an old job, we had a central VAX server running VMS. It had an uptime of almost 6 years. I was there when they had to reboot it and it was this big major event. The sysadmin, who had been hired long before me, started after the last time it was rebooted, so he was visibly sweating. Everything came right back up.