Some software prints error messages to the console that may not necessarily show up on your SSH session. Using the vcs devices can let you examine these. From within an SSH session, run the following command on a remote server: # cat /dev/vcs1. This will show you what is on the first console. You can also look at the other virtual terminals using 2, 3, etc. If a user is typing on the remote system, you'll be able to see what he typed.
In most data farms, using a remote terminal server, KVM, or even Serial Over LAN is the best way to view this information; it also provides the additional benefit of out-of-band viewing capabilities. Using the vcs device provides a fast in-band method that may be able to save you some time from going to the machine room and looking at the console.
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