Dan Nelson wrote:
In the last episode (May 16), Eric Anderson said:
I have a few large NFS file servers, holding about 1Tb of diskspace
each. I break those logical disks (it's on a hardware RAID) into
partitions, and share them. My users fill up the partitions often
enough, and when they do, they rm entire directory trees to free the
space. They use du to determine how much space is in a directory and
how much they are hogging.
The problem I'm having is, after they do the rm's, it doesn't free the
disk space. df shows it still being used, but du claims their
directories are empty.
If I reboot the file server, the space magically appears.
I was thinking that it was because a process was using the data, or
directories the data was removed from, so the blocks weren't actually
freed, but that seems a little odd to me, since they claim (and
different users have the same issues, and make the same claims) that
nothing should be touching those areas at all.
How do I get FreeBSD to release those blocks without rebooting?
Does a du on server itself show files? How about "lsof +L1"? The NFS
protocol doesn't allow clients to unlink files they have open, so
FreeBSD clients (at least) rename open files that are unlinked to
.nfs##### until the last process closes the file, and then they delete
it. If you've got unlinked files held open, it's got to be on the
server itself.
Du on the server shows the same as on the client - only a small amount
used (36Gb used) whereas a df shows 152Gb used. I am using solaris and
linux clients mostly. This happened on FreeBSD 4.6, and continues on
this 4.9-RELEASE machine (same partitions, just an upgraded OS).
Eric
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Eric Anderson Sr. Systems Administrator Centaur Technology
Today is the tomorrow you worried about yesterday.
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