How is it possible to backup a server by cloning the second hard drive onto the other, so in the event of the first hard drive going down the second hard drive can simple be used while a replacement is added. Can is this possible and is there any pre-made software that will do this today ? BTW, I am talking about unix (mainly linux, possibly freebsd).
You can also just have identical OS's on both drives and just rsync everything except /boot - That works well and doesn't have any raid (mirroring) related problems - Once data is deleted with raid it's gone forever, on both drives..
Software raid is the way to go for linux if thats what you want to do.. for me anyway