i cannot backup / partition with dump on my FC3 machine.


I'm using 
amanda-2.4.4p3-1 on both server and client

Steps to Reproduce:
i have configured my amanda server to backup a / partition on my FC3
computer. I use the mountpoint / in my disklist file
  
i got the following report
sonde      / lev 0 FAILED [disk /, all estimate failed]


here is some information from the sendize file on the client.
sendsize[23903]: time 0.021: calculating for amname '/', dirname '/',
spindle 1
sendsize[23903]: time 0.021: getting size via dump for / level 0
sendsize[23903]: time 0.021: calculating for device '/dev/root' with
'ext3'
sendsize[23903]: time 0.021: running "/sbin/dump 0Ssf 1048576
- /dev/root"
 
the /dev/sdb2 is mounted on / partition
but instead of using /dev/sdb2 it uses /dev/root for backup
here is the right of the two devices

brw-------  1 root root 8, 18 avr  1 16:48 /dev/root
brw-rw----  1 root disk 8, 18 avr  1 16:48 /dev/sdb2

then amanda could use the second on but not the first one.

has somebody already had this problem?

thank in advance for any help