release the space from system
 

one of volumn in my server is 100% usage , I have already removed some files in this volumn , but the volumn is still 100% full , now I still can't install program to this volumn , can advise how can I release the space from the system ? thx

/dev/sda9 12154965 12015428 0 100% /

Well aside from deleting files, you don't havea lot of choice. Typically an amount of space is kept free for essential system tasks, and that's why a small amount of deletion can leave things at 100%. How much is reserved depends on what you selected or your partitioner selected at install time.

thx reply ,

I have deleted 5G of data ( not small amount of deletion ) , but the server is still not release this space , except reboot, how to release the space ? thx

Files that are still open will not release the space till they are closed by every connected process.
"lsof" is usually the best way to sort this out.
Reboot of course has the same effect.

Reboots should always be last resort in *nix world. lsof should find the processes holding onto the files you deleted which will free up the space. Usually a simple restart of the process will do, no need to reboot the whole machine.