On Mon, Jan 18, 2010 at 03:25:56PM -0800, Erik Trimble wrote: > Hopefully, once BP rewrite materializes (I know, I'm treating this > much to much as a Holy Grail, here to save us from all the ZFS > limitations, but really...), we can implement defragmentation which > will seriously reduce the amount of reserved space required to keep > up performance.
I doubt that. I expect bp-rewrite in general, and its use for effective defragmentation in particular, to require rather *more* free space to be available. Of course, you may be able to add that space by stretching a raidz vdev to one more disk, but you also may not due to other constraints (not enough ports, etc). Another poster pointed out recently that you can readily add more reserved space using an unmounted filesystem with a reservation of the appropriate size. This is most relevant for systems without the "stop looking a start ganging" fix.
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