Linux 刪除檔案而沒釋放空間

# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos_gp8-root 52401156 52401136 20 100% /
# rm -rf /var/log/nv-hostengine.log
# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos_gp8-root 52401156 52401136 20 100% /

有時候沒有正確停止該停掉的程序，會遇到刪除某個檔案而沒有釋放出該檔案所佔用的空間，這時候就要清除該檔案相關的程序才能正確釋放空間。

# lsof|grep deleted
nv-hosten 17859 root 22w REG 253,0 12665814398 118637824 /var/log/nv-hostengine.log (deleted)
nv-hosten 17859 17870 root 22w REG 253,0 12665814398 118637824 /var/log/nv-hostengine.log (deleted)
nv-hosten 17859 17871 root 22w REG 253,0 12665814398 118637824 /var/log/nv-hostengine.log (deleted)
cache_mgr 17859 18131 root 22w REG 253,0 12665814398 118637824 /var/log/nv-hostengine.log (deleted)
nv-hosten 17859 18139 root 22w REG 253,0 12665814398 118637824 /var/log/nv-hostengine.log (deleted)
cache_mgr 17859 18143 root 22w REG 253,0 12665814398 118637824 /var/log/nv-hostengine.log (deleted)
dcgm_ipc 17859 18145 root 22w REG 253,0 12665814398 118637824 /var/log/nv-hostengine.log (deleted)

然後 kill -9 上面的結果，這樣就能釋放出檔案的空間

# kill -9 17859

這個範例 其實應該要正確地停止服務才能有效地移除檔案

# systemctl stop prometheus-dcgm

但是有時候會腦殘忘記