We're encountering some problems on FreeBSD 6.1 SMP with a number of
end-user systems where a Postgresql database is growing to the point
where the filesystem is nearly full or completely runs out of free
space. After this point, df shows wildly incorrect values for available
space, sometimes even showing more space available than there allocated
to the partition (and our systems rely on df to determine when to send
warnings to end-users that the free disk space is getting low). We've
found the only way to correct the situation is to take the system down
to single-user mode and force a non-background fsck on the partition -
simply rebooting the system does not fix the situation.
We're going to try setting debug.mpsafevfs to 0 in /boot/loader.conf to
see if this works around the problem. I've gone through the CVS logs
for src/sys/ufs/ffs/* but I haven't seen anything that would
specifically apply to this problem. Has anyone else seen this problem,
and by chance is it resolved for 6.2?
Thanks,
Guy
--
Guy Helmer, Ph.D.
Chief System Architect
Palisade Systems, Inc.
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