I have a NFS server running FreeBSD-4.9-RELEASE. It's run fine for several months with five FreeBSD 4.9 systems mounting it's filesystems. Suddenly something started using disk space at the rate of 10 GB/hour on one of the filesystems (which has exported directories). The catch is that a du -k shows a total usage for that file system of much less than df -k. du -k essentially shows the disk usage before the available space started to disappear! Normally I'd presume someone's hiding files under a mount point when I see this but nothings mounted on a directory in this filesystem. Upon reboot the space is not used anymore, df -k and du -k report similar values.

Quite simply odd. Some other details... ...this has happened twice in one day, and the rate of "ghost" disk usage is constant and identical in both graphs. The file server is used to serve files to clustered web servers. There's considerable write activity to the NFS server all the time (40-60Mbit/sec) and moderate read access (~10Mbit/sec).

Any ideas what would cause the df -k and du -k discrepancy?

Michael Conlen

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