solaris下的文件系统空间清除问题

angrytiger

solaris8的机器
/var下的空间满了，把/var/log里面的无用大文件删除后
＃df -k /var
/dev/dsk/c0t0d0s3 962571 958172 0 100% /var
仍然显示占用100%
du -sk /var
显示空间只占用了100M
如何才能将该部分空间释放出来(不能重新启动机器）

bloomit

I have ever met this suitation. I do not know the exact reason. perhaps it some priviledged daemon that log some info in /var. I can only tell you how to find the possible largest file and how to enlarge /var online.

1.Find the possible largest file and check if it can be eliminate from var
#du -sk /var/*/* | sort -nr
Some file related to mail, log etc can be touched to 0 size.

2. The worst thing is that so much /var space is occupied by /var/run, /var/tmp. Reboot system may solve this. As for you, your server can not be rebooted. perhaps you need to online revise your /var size.
move /var to new disk(if /var is not in /)
#umount /var
Then add a new disk,
#newfs /dev/dsk/cntxdysz
# mount -F ufs /dev/cntxdysz /var
Then ufsdump /var on it.

slls

我以前在HP-UX也遇到过。
但如果用>清空文件的话空间就可以释放，不知道是为什么?

qch1521

lsof is a good tool to analyse such kind of problem, basically, this issue is due to some unix process which hold the diskspace was not killed.
lsof will help to identified the unix process after killed the process the diskspace will be released.
or, just reboot the box.

angrytiger

thanks a lot!

i used the fuser -cu /var to identify the process and killed the hanged process.
So,i\'ve released the space.