> If the added device is slower, you will experience a slight drop in
> per-op performance, however, if your working set needs another SSD,
> overall it might improve your throughput (as the cache hit ratio will
> increase).

Thanks for your fast reply!  I think I know the answer to this question,
but what is the best way to determine how large my pool's l2arc working set
is (i.e. how much l2arc is in use)?

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