[root@sat /var]# du -m -s *
1       account
1       agentx
1       at
1       audit
1       backups
1       crash
1       cron
122     db
1       empty
1       ftp
1       games
1       heimdal
19      log
1       mail
1       msgs
2       named
1       net-snmp
1       preserve
1       run
1       rwho
1       spool
3       tmp
0       www
1       yp
[root@sat /var]# df -h
Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/ad4s1a    496M    294M    163M    64%    /
devfs          1.0K    1.0K      0B   100%    /dev
/dev/ad4s1e    496M     67M    389M    15%    /tmp
/dev/ad4s1f    353G    114G    210G    35%    /usr
/dev/ad4s1d    2.9G    2.5G    168M    94%    /var
devfs          1.0K    1.0K      0B   100%    /var/named/dev
[root@sat /var]#

как в видно в /var 2.5 гига занято, а на самом деле 150 метров....!!!
а то достало просто это:
/var: write failed, filesystem is full

/var: write failed, filesystem is full

/var: write failed, filesystem is full

/var: write failed, filesystem is full

/var: write failed, filesystem is full

/var: write failed, filesystem is full

/var: write failed, filesystem is full