I've just reinstalled the RH9. I chose not to format the /home partition, which is /dev/hda9 in my filesystem. After installation, surprisingly, i found that I cannot access the former user directory. I had to add a new user and delete the old one.(i used mandrake9 before)
The problem now is, I can't write anything on the /home partition, since the OS believe it is full, although it is far away from it.
df -H
Filesystem Size Used Avail Use% Mounted on
/dev/hda10 3.4GB 2.8GB 424MB 87% /
/dev/hda9 311MB 311MB 0 100% /home
none 123MB 0 123MB 0% /dev/shm

how can i solve the problem?
Thanks in advance.

if the filesystem is damaged
umount /home
fsck /dev/hda9
but if i were you i would take a look around the /home directory, redhat leaves temporary files on the hard-drive after installation.

Something else you can try, with /home mounted, do (as root):

cd /home
du -s *

That'll show you a summary of how much space each directory inside /home is taking up. If there's a really big one, go into that directory and do another 'du -s *' to see if the space is being eaten up by some directory inside there... repeat until you figure out where all the space is going

You can also use the 'find' command to locate excessively large files, but the space might not be in large files. Try this, though:

find /home -size +10000k

That'll show you anything more than 10MB in size. You might also want to look for core.xxx files, since those get dumped whenever a program crashes. If you see anything called core.12345 or such, delete them immediately. You can use find to locate those also:

find /home -name 'core.*'

sound horrible

Are you trying to add something to the end of an already-existing file or create a new file?