On 9/26/2012 11:18 AM, 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

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)?

Easiest way:

zpool iostat -v

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