I've a Linux Centos (5.0) machine with 2 disks. I was changing the SATA cable to one of the disk when I realized that depending on what SATA slot I'm using, the OS starts from sda or sdb.
The problem is that I have daily backups from sda to sdb (merely copies), if by accident someone change the SATA cable, I will screw up and overwrite new data with old data.
The only thing that I know is, that current boot disk is the good one. How I can certainly know which disk is the current boot disk (sda or sdb)?
Additional info: I've no physical access to the machine.