ZFS and mdconfig -t vnode - Unexpected behavior
Bob Friesenhahn
bfriesen at simple.dallas.tx.us
Thu Mar 8 22:35:25 UTC 2012
On Thu, 8 Mar 2012, Dan Rue wrote:
>
> Under ZFS, it can take as long as 30 seconds before the block size as
> reported by du -k has been updated. The fsync appears to be a noop.
Zfs under Solaris has the same behavior. This data is only assured to
be available after the current zfs TXG has been synced, which may take
a long time. It also becomes available after the 'sync' system call
has completed (because the current TXG is flushed).
> Are there any ZFS tunables that could be related to this? What could be
> the cause of this behavior?
You could adjust the tunings for zfs transaction groups but this will
decrease system performance and increase pool fragmentation.
Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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