Yes its always good to know uptime for Server.You can check Server uptime by using following commands.
root@admin [~]# uptime
04:34:25 up 20 days, 14:31, 1 user, load average: 0.15,07.33,0.76
root@admin [~]# w
04:34:20 up 20 days, 14:31, 1 user, load average: 0.15,07.33,0.76
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root@admin [~]#top
top – 04:36:17 up 20 days, 14:33, 1 user, load average: 0.15,07.33,0.76
Tasks: 290 total, 1 running, 283 sleeping, 0 stopped, 6 zombie
Cpu(s): 2.6%us, 1.4%sy, 0.0%ni, 78.9%id, 16.9%wa, 0.0%hi, 0.2%si, 0.0%st
