> It would also be interesting to see some snapshots
> of the ZFS arc kstats
> 
> kstat -n arcstats

Here you go, although I didn't see anything jump out (massive amounts of cache 
misses or something).  Any immediate trouble spot?

# kstat -n arcstats
module: zfs                             instance: 0
name:   arcstats                        class:    misc
        c                               53490612870
        c_max                           67636535296
        c_min                           8454566912
        crtime                          212.955493179
        deleted                         7267003
        demand_data_hits                179708165
        demand_data_misses              189797
        demand_metadata_hits            9959277
        demand_metadata_misses          194228
        evict_skip                      1709
        hash_chain_max                  9
        hash_chains                     205513
        hash_collisions                 9372169
        hash_elements                   851634
        hash_elements_max               886509
        hdr_size                        143082240
        hits                            198822346
        l2_abort_lowmem                 0
        l2_cksum_bad                    0
        l2_evict_lock_retry             0
        l2_evict_reading                0
        l2_feeds                        0
        l2_free_on_write                0
        l2_hdr_size                     0
        l2_hits                         0
        l2_io_error                     0
        l2_misses                       0
        l2_rw_clash                     0
        l2_size                         0
        l2_writes_done                  0
        l2_writes_error                 0
        l2_writes_hdr_miss              0
        l2_writes_sent                  0
        memory_throttle_count           0
        mfu_ghost_hits                  236508
        mfu_hits                        165895558
        misses                          388618
        mru_ghost_hits                  70149
        mru_hits                        24777390
        mutex_miss                      6094
        p                               49175731760
        prefetch_data_hits              7993639
        prefetch_data_misses            370
        prefetch_metadata_hits          1161265
        prefetch_metadata_misses        4223
        recycle_miss                    7149
        size                            53490565328
        snaptime                        5759009.53378144
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