how do I tell FreeBSD to sync, for real ?

Danny Howard dannyman at
Wed Nov 9 23:57:51 GMT 2005

On Tue, Nov 08, 2005 at 04:34:04PM -0500, user wrote:
> Sometimes you delete a large batch of files, or you do some other serious
> FS operations and the output of `df` does not tell you immediately of the
> new disk space, etc.
> If you run something like:  sync
> Or even:  sync ; sync


can you describe a reproducible phenomenon?

Did you delete something from /var/log and you're waiting for df to
reflect that?  This is a common one ... if a process has a filehandle
open, and you delete the file, the blocks on disk are not freed until
the process closes that filehandle.

If this is what's thwarting you, check out lsof. :)



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