Re: UNIX question du vs df -> large discrepancy

Two things can cause this type of discrepency:

1. File space is not released back to the filesystem as long as any process has the file open. You can, therefore, create a big file, open it with some program (not vi), delete it from the directory, and not see any change in the df until the program is closed. In fact, that's a good way to create hidden workfiles in unix programs, which are cleaned up automatically when the program ends.

Based on what you're saying, this is probably the case. 'fuser' might help you locate the file and program.

2) Unix filesystems are weird in that you don't have to actually allocate all the space for a given size of file. You can, for instance, create a file in a program, write 1K bytes at the beginning of the file, fseek to the 1MB point, write another 1K bytes, and close the file. The file will show as 1MB size, but will only *use* 2K on the disk.

At 02:07 PM 7/25/00 -0800, you wrote:
>
>Any ideas? 936 kb vs 480 Mb is good size difference. It's been like this for
>two days. du reflects what I see in the directories.
>
>df -k /opt/oracle
>Filesystem kbytes used avail capacity Mounted on
>/dev/vx/dsk/rootdg/Oraclefiles
> 479982 479514 0 100% /opt/oracle
>
>du -dsk /opt/oracle
>936 /opt/oracle
>
>
>- Paul
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>Author: Troiano, Paul (CAP, GEFA)
> INET: Paul.Troiano_at_gecapital.com
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---
Dennis Taylor
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