Столкнулся с ситуацией, когда место на винте кончается, а что именно заняло диск - не понятно:
[root@host ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 275G 254G 21G 93% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
/dev/sda1 1.8T 39G 1.8T 3% /home
/dev/sdc1 110G 3.2G 107G 3% /var/lib/mysql
[root@host ~]# du -shx /*
7.6M /bin
71M /boot
180K /dev
32M /etc
39G /home
332M /lib
23M /lib64
16K /lost+found
4.0K /media
4.0K /mnt
63M /opt
0 /proc
71M /root
13M /sbin
4.0K /selinux
4.0K /srv
0 /sys
12K /tmp
2.1G /usr
1.4G /var
[root@host ~]# find /proc/*/fd -ls | grep '(deleted)'
1639634485 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12922/fd/2 -> /var/log/nginx/error.log-20150513\ (deleted)
1639634501 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12922/fd/18 -> /var/log/nginx/error.log-20150513\ (deleted)
1639634510 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12922/fd/27 -> /var/log/nginx/site.ru_nginx_access.log-20150514\ (deleted)
1639634511 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12922/fd/28 -> /var/log/nginx/site.ru_nginx_error.log-20150513\ (deleted)
1639634512 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12922/fd/29 -> /var/log/nginx/site.com_nginx_error.log-20150513\ (deleted)
1639638494 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12923/fd/2 -> /var/log/nginx/error.log-20150513\ (deleted)
1639638510 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12923/fd/18 -> /var/log/nginx/error.log-20150513\ (deleted)
find: `/proc/12923/fd/511': No such file or directory
find: `/proc/12923/fd/667': No such file or directory
1639642375 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12924/fd/2 -> /var/log/nginx/error.log-20150513\ (deleted)
1639642390 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12924/fd/18 -> /var/log/nginx/error.log-20150513\ (deleted)
1639642399 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12924/fd/27 -> /var/log/nginx/site.ru_nginx_access.log-20150514\ (deleted)
1639642400 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12924/fd/28 -> /var/log/nginx/site.ru_nginx_error.log-20150513\ (deleted)
1639642401 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12924/fd/29 -> /var/log/nginx/site.com_nginx_error.log-20150513\ (deleted)
1639646126 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12925/fd/2 -> /var/log/nginx/error.log-20150513\ (deleted)
1639646142 0 l-wx------ 1 apache apache 64 Jun 17 20:57 /proc/12925/fd/18 -> /var/log/nginx/error.log-20150513\ (deleted)
1746513574 0 lrwx------ 1 root root 64 Jun 19 07:01 /proc/16454/fd/72 -> /var/run/dovecot/login-master-notify995d7209624407dc\ (deleted)
1746513581 0 lrwx------ 1 root root 64 Jun 19 07:01 /proc/16454/fd/79 -> /var/run/dovecot/login-master-notifycd1113eecfa6b6fd\ (deleted)
1639653458 0 l-wx------ 1 root root 64 Jun 17 20:57 /proc/33016/fd/3 -> /var/log/puppet/puppet.log-20150118\ (deleted)
[root@host ~]#
[root@host ~]# service nginx restart
Stopping nginx: [ OK ]
Starting nginx: [ OK ]
[root@host ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 275G 4.5G 270G 2% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
/dev/sda1 1.8T 39G 1.8T 3% /home
/dev/sdc1 110G 3.2G 107G 3% /var/lib/mysql
[root@host ~]#
