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?


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