Exim falling over, fixed by reboot - disk problem?

Hi, I administer three lightly loaded and very similarly configured Debian 3 machines and only one of them ever seems to give me grief. A couple of months ago it dropped the authentication database and the boot messages showed something about recovering the journal. Just now we had this proble

Problem with disk going read only due to errors.

Hi, I came in this morning to find a user unable to check his email - reporting an unknown password. In tried to change his password and couldn't, it turns out the drive had gone read only. router:/var/log# mount /dev/hda2 on / type ext3 (rw,errors=remount-ro) proc on /proc type proc (rw) devpt