I've inherited a number of different systems to administer. One of them is an HP Itanium running a version of Redhat. Today the system died and when I try to reboot selecting RedHat from the EFI Boot Manager, I got the message saying that the Load of Redhat failed: Not found.
I'm confused as to how to diagnose the problem from here.
It would appear to me, that the first disk (the /boot/efi) is on /dev/sda1 has died and needs to be replaced. The other second disk (/dev/sdb1) is the root disk. I know this from a similarly provisioned HP Itanium system which is its twin.
If this is the only problem, any suggestions on the quickest way to recover.....aside from reinstallation of RH after the disk replacement.