I'm posting here to have your points of view on my problem.
Part of my job is to manage backup servers but I'm new in LINUX world.
Today I had to repair a backup server running on CentOS 6.xx.
The problem is that the backup was set up to save the server data on an external hard drive. The hard drive was supposed to be mounted on sde1 part. But one day, the sde1 part became unreachable and the external HDD part became sdf1, screwing the backup.
So my question is : what can cause this to happen? Do you have an idea why, suddenly, sde1 became unusable? Can it be a hardware issue?