this thread has great tips on how to track down where your plate is full and get some space. Happened to me (as noted above) by not realizing I had backups in background.
http://pbxinaflash.com/community/threads/db-error-connect-failed.7628/?t=7628
To see where the largest (or fullest) directory is do this (as root):
cd /
du -sk * | sort -n
This will tell you which directories are the fullest, starting with the emptiest. Then start in that directory and work your way backwards.
Note: when your PBX hard drive is full, you can still receive phone calls.
But you can't do anything database related (park calls, retrieve voice mails, etc.) ... any MySQL needs room to work.
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