Hello Alessandro,
I think that's because your /space partition is almost filled-up...
with this command verify what file consuming the most of the space:
/usr/local/avamar/var/mc/#: du -h
you will probably find database dump file (mcs_data_dump.sql) which takes much of the space so I would advise you to increase /dev/sda disk space and extend /space (9) partition.