We have a 740 filer running 6.0.1R3.  Last night I got a page that "nothing was working".  I headed into work and found that:
 
1) I could not telnet into the filer.
2) I could not get in through console either.
3) The display on the front of the filer said 850 ops but the activity led wasn't flashing at all.
 
I figured I had no choice, so I shut it down hard and brought it back up.  Everything came up fine.  The message file posted a time stamp at 11:00pm but nothing at midnight (this was 1:30am).  The message file also said that the fiiler was down for 6057 secs.  The crash folder had one file in it called "bounds" and just contained "-1 -1".  Backups were being performed at the time using Veritas Backup Exec.  The backup log said everything was going fine until it found a "corrupted file", then it started skipping files until the filer was rebooted and it started in backing up again.  We're trying to figure out what went wrong but didn't have much to go on.  Anyone have any thoughts where to look now (or if this happens again)?
 
"No matter where you go, there you are."
 
Paul Maglinger
System Administrator
Shoe Carnival, Inc.