On 09/26/2012 05:18 PM, Matt Van Mater wrote:
>> 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)?

Go grab arcstat.pl from
- that's the tool you're looking for.

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