bdf + f/s issue

[Scott_20]

all,
i have a 500MG vg00/root, the usage was up to
92%, so I removed a 100MG file, but the % used hasn't changed. One of our engineers said it had to do with space for overhead management. can some expound, or recommend how I can fix the problem?
thanks

[Geno Church_1]

Could be that the file you deleted was held open by someone else or another application was writing to it. If you reboot the machine the space will be reallocated.

Geno

[A. Clay Stephenson]

If I can do the math a 500MB filesystem housing a 100MB file should free about 20% but ALL of that free space was for overhead management. I suggest that you lift that engineer overhead and drop him.

Removing a file (unlinking in UNIX speak) only reduces the link count. If the link count is zero, the directory entry is removed. The file is not actually removed until all processes which had the file open either close the file or terminate. You need to use fuser or better lsof to find the process that is still using the file and terminate it.

[Sridhar Bhaskarla · Accepted solution]

Hi Scott,

If you removed 100MB file, the usage would definitely change as the overhead is inclusive of 92%.

The file you removed is being used by a process. Unless the process releases it, you won't see the difference utilization.

What you can do is to run "lsof" and find out the open files. If you scroll through the output, you will find a line where the 7th column is ~100MB with 8 column indicating hte logical volume for vg00/root. The first and second columns give you the process and the pid respectively. Make sure it is not going to impact the system if you shutdown the process.

You can get lsof from

ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/

Once it is installed, you can run it as

/opt/lsof/bin/lsof /dev/vg00/lvol3 > /tmp/lsof.out.

-Sri

[Robert-Jan Goossens]

Hi Scott,

You probably removed an open file. You will have to find the process that keeps the file open. lsof is a great tool for these kinds of actions.

Hope this helps,
Robert-Jan

[doug mielke]

du -ks /dirname should give an an accurate number.