Maybe there are too many I/Os for this controller.

You may try this settings
B130
echo zfs_txg_synctime_ms/W0t2000 | mdb -kw 
echo zfs_vdev_max_pending/W0t5 | mdb -kw 

older versions
echo zfs_txg_synctime/W0t2 | mdb -kw 
echo zfs_vdev_max_pending/W0t5 | mdb -kw 

Andreas
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