[zfs-discuss] zfs diff performance

Ian Collins
Sun, 26 Feb 2012 22:42:39 -0000

I had high hopes of significant performance gains using zfs diff in
Solaris 11 compared to my home-brew stat based version in Solaris 10.
However the results I have seen so far have been disappointing.

Testing on a reasonably sized filesystem (4TB), a diff that listed 41k
changes took 77 minutes.  I haven''t tried my old tool, but I would
expect the same diff to take a couple of hours.

The box is well specified, an x4270 with 96G of RAM  and a FLASH
accelerator card used for log and cache.

Are there any ways to improve diff performance?

--
Ian.