DB archiver full with "db_recovery_file_dest_size"=10g

Hi,
we have original set in init ORA parameter to be:

*.db_recovery_file_dest_size=10737418240
*.db_recovery_file_dest='/orabackup/flash_recovery_area'

file system usage: (notice '/orabackup' has 57+ GB free)

[oracle@]$df -h

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
25G 3.9G 20G 17% /
/dev/cciss/c0d0p1 99M 35M 60M 37% /boot
none 7.9G 0 7.9G 0% /dev/shm
/dev/mapper/VolGroup00-LogVol03
16G 587M 15G 4% /opt
/dev/mapper/VolGroup00-LogVol02
16G 247M 15G 2% /var
/dev/sda1 50G 30G 18G 64% /oracle
/dev/sdb1 9.9G 1.7G 7.8G 18% /oralog01
/dev/sdf1 74G 50G 21G 72% /oradata
/dev/sde1 9.9G 2.3G 7.2G 24% /oralog02