linux清理日志后，磁盘还是很高

清理了日志文件，但是df -h还是高，du -sh很低。
[appdeploy@CNSZ17VLK6137:/home/appdeploy]$lsof |grep delete
[appdeploy@CNSZ17VLK6137:/home/appdeploy]$su - sfadmin
Password:
[root@CNSZ17VLK6137:/sfadmin]#
[root@CNSZ17VLK6137:/sfadmin]#lsof |grep delete
nginx 27675 root 2w REG 253,2 944555501 918050 /app/openresty/nginx/logs/error.log-20220624 (deleted)
nginx 27675 root 5w REG 253,2 944555501 918050 /app/openresty/nginx/logs/error.log-20220624 (deleted)
nginx 27675 root 6w REG 253,2 48207482348 917994 /app/openresty/nginx/logs/access.log-20220624 (deleted)
[root@CNSZ17VLK6137:/app]#/app/openresty/nginx/sbin/nginx -s reload 需要等待了1分钟左右，看数据量大小。
[root@CNSZ17VLK6137:/app/openresty/nginx/logs]#df -h /app
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VGapp-LVapp
50G 47G 397M 100% /app
[root@CNSZ17VLK6137:/app]#lsof |grep delete
[root@CNSZ17VLK6137:/app]#df -h /app
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VGapp-LVapp
50G 435M 47G 1% /app