I go this message last night:
NOTES:
  planner: Last full dump of www:sda11 on tape  overwritten in 1 run.

And yet, I have plenty of level 0 backups:
amanda@www:~$ amadmin Outside find www sda11
Scanning /dumps/amanda...

date       host disk  lv tape or file file status
2004-06-09 www  sda11  2 Outside-21     10 OK
2004-06-11 www  sda11  3 Outside-01     12 OK
2004-06-12 www  sda11  0 Outside-02     15 OK
2004-06-15 www  sda11  1 Outside-03     12 OK
2004-06-16 www  sda11  2 Outside-04     13 OK
2004-06-17 www  sda11  3 Outside-05     11 OK
2004-06-19 www  sda11  3 Outside-07     14 OK
2004-06-22 www  sda11  0 Outside-08     15 OK
2004-06-23 www  sda11  1 Outside-09     13 OK
2004-06-24 www  sda11  2 Outside-10     13 OK
2004-06-25 www  sda11  3 Outside-11      9 OK
2004-06-26 www  sda11  0 Outside-12     16 OK
2004-06-29 www  sda11  1 Outside-13     12 OK
2004-06-30 www  sda11  2 Outside-14     11 OK
2004-07-01 www  sda11  3 Outside-15     10 OK
2004-07-02 www  sda11  3 Outside-16     12 OK
2004-07-03 www  sda11  3 Outside-17     11 OK
2004-07-07 www  sda11  0 ---             0 FAILED (driver) [dump to tape failed]
2004-07-07 www  sda11  0 ---             0 FAILED (dumper) ["data write: 
Connection reset by peer"]
2004-07-07 www  sda11  0 Outside-19     14 [out of tape]
2004-07-08 www  sda11  0 Outside-20     16 OK
amanda@www:~$ 

This indicates that one was just made last night, but three others existed 
within the tapecycle.

My amanda.conf setting are:
dumpcycle 8             # the number of days in the normal dump cycle
runspercycle 8          # the number of amdump runs in dumpcycle days
tapecycle 15 tapes      # the number of tapes in rotation

Is this message indicating that there's no level 0 backup within the last 
dumpcycle tapes? 

This isn't a big concern; I've been just ignoring it for a couple of years now. 
But today, I'm curious and have the time to write about it.

Also, is there something missing after the word 'tape' in the message, 
"planner: Last full dump of www:sda11 on tape  overwritten in 1 run."? On my 
other operating amanda system, this is usually filled in by the tape name.

Thanks for your thoughts and suggestions.

-Kevin

-----
E. Kevin Zembower
Unix Administrator
Johns Hopkins University/Center for Communications Programs
111 Market Place, Suite 310
Baltimore, MD  21202
410-659-6139