I am running a server in Dell which has RAID1 and hot plug 2 disks. It's been running for a while, but I was thinking it may crash anytime. So got a spare one, and wanted to test it how it works.
I have never done this before. Can I simply, on a running machine, unplug the Disk 2 and connect the new Disk there? (Without interrupting the service as a silent mode?)
Or does it have to be shutdown first, and unplugged, reinstalling all software/centos/etc etc? How do you do this update?
P.S: Also how do you know when you replaced the disk? Do you have anything special to monitor that disk 1 or disk 2 is end of life?