I did a check on the copy vs move and they both write the data again seemingly
because of the COW (copy on write nature)
here's the copy (diff seems it does a read first):
./iosnoop
UID PID D BLOCK SIZE COMM PATHNAME
500 890 R 4413696 65536 cp <none>
500 890 R 4390145 131072 cp <none>
500 890 R 4390401 131072 cp <none>
500 890 R 4390657 131072 cp <none>
500 890 R 4390913 131072 cp <none>
500 890 R 4391169 131072 cp <none>
500 890 R 4391425 131072 cp <none>
500 890 R 4391681 131072 cp <none>
0 796 R 4391937 131072 zpool-abyss <none>
0 796 R 4392193 131072 zpool-abyss <none>
0 796 R 4392449 131072 zpool-abyss <none>
0 796 R 4392705 131072 zpool-abyss <none>
0 796 R 4392961 131072 zpool-abyss <none>
0 796 R 4393217 131072 zpool-abyss <none>
0 796 R 4393473 131072 zpool-abyss <none>
0 796 R 4393729 131072 zpool-abyss <none>
0 796 R 4393985 131072 zpool-abyss <none>
0 796 R 4394241 131072 zpool-abyss <none>
0 796 R 4394497 131072 zpool-abyss <none>
0 796 R 4394753 131072 zpool-abyss <none>
0 796 R 4395009 131072 zpool-abyss <none>
0 796 R 4395265 131072 zpool-abyss <none>
0 796 R 4395521 131072 zpool-abyss <none>
0 796 R 4395777 131072 zpool-abyss <none>
0 796 R 4396033 131072 zpool-abyss <none>
0 796 R 4396289 131072 zpool-abyss <none>
0 796 R 4396545 131072 zpool-abyss <none>
0 796 R 4396801 131072 zpool-abyss <none>
0 796 R 4397057 131072 zpool-abyss <none>
0 796 R 4397313 131072 zpool-abyss <none>
0 796 R 4397569 131072 zpool-abyss <none>
0 796 R 4397825 131072 zpool-abyss <none>
0 796 R 4398081 131072 zpool-abyss <none>
0 796 R 4398337 131072 zpool-abyss <none>
0 796 R 4398593 131072 zpool-abyss <none>
0 796 R 4398849 131072 zpool-abyss <none>
0 796 R 4399105 131072 zpool-abyss <none>
0 796 R 4399361 131072 zpool-abyss <none>
0 796 R 4399617 131072 zpool-abyss <none>
0 796 R 4399873 131072 zpool-abyss <none>
0 796 R 4400129 131072 zpool-abyss <none>
0 796 R 4400385 131072 zpool-abyss <none>
0 796 R 4400641 131072 zpool-abyss <none>
0 796 R 4400897 131072 zpool-abyss <none>
0 796 R 4401153 131072 zpool-abyss <none>
0 796 R 4401409 131072 zpool-abyss <none>
0 796 R 4401665 131072 zpool-abyss <none>
0 796 R 4401921 131072 zpool-abyss <none>
0 796 R 4402177 131072 zpool-abyss <none>
0 796 R 4402433 131072 zpool-abyss <none>
0 796 R 4402689 131072 zpool-abyss <none>
0 796 R 4402945 131072 zpool-abyss <none>
0 796 R 4403201 131072 zpool-abyss <none>
0 796 R 4403457 131072 zpool-abyss <none>
0 796 R 4403713 131072 zpool-abyss <none>
0 796 R 4403969 131072 zpool-abyss <none>
0 796 R 4404225 131072 zpool-abyss <none>
0 796 R 4404481 131072 zpool-abyss <none>
0 796 R 4404737 131072 zpool-abyss <none>
0 796 R 4404993 131072 zpool-abyss <none>
0 796 R 4405249 131072 zpool-abyss <none>
0 796 R 4405505 131072 zpool-abyss <none>
0 796 R 4405761 131072 zpool-abyss <none>
0 796 R 4406017 131072 zpool-abyss <none>
0 796 R 4406273 131072 zpool-abyss <none>
0 796 R 4406529 131072 zpool-abyss <none>
0 796 R 4406785 131072 zpool-abyss <none>
0 796 R 4407041 131072 zpool-abyss <none>
0 796 R 4407297 131072 zpool-abyss <none>
0 796 R 4407553 131072 zpool-abyss <none>
0 796 R 4407809 131072 zpool-abyss <none>
0 796 R 4408065 131072 zpool-abyss <none>
0 796 R 4408321 131072 zpool-abyss <none>
0 796 R 4408577 131072 zpool-abyss <none>
0 796 R 4408833 131072 zpool-abyss <none>
0 796 R 4409089 131072 zpool-abyss <none>
0 796 R 4409345 131072 zpool-abyss <none>
0 796 R 4409601 131072 zpool-abyss <none>
0 796 R 4409857 131072 zpool-abyss <none>
0 796 R 4410113 131072 zpool-abyss <none>
0 796 R 4410369 131072 zpool-abyss <none>
0 796 R 4410625 131072 zpool-abyss <none>
0 796 R 4410881 131072 zpool-abyss <none>
0 796 R 4411137 131072 zpool-abyss <none>
0 796 R 4411393 131072 zpool-abyss <none>
0 796 R 4411649 131072 zpool-abyss <none>
0 796 R 4411905 131072 zpool-abyss <none>
0 796 R 4412161 131072 zpool-abyss <none>
0 796 R 4412417 131072 zpool-abyss <none>
0 796 R 4412673 131072 zpool-abyss <none>
0 796 R 4412929 131072 zpool-abyss <none>
0 796 R 4413185 131072 zpool-abyss <none>
0 796 R 4413442 131072 zpool-abyss <none>
0 796 W 7349299 131072 zpool-abyss <none>
0 796 W 7349811 131072 zpool-abyss <none>
0 796 W 7349555 131072 zpool-abyss <none>
0 796 W 7350067 131072 zpool-abyss <none>
0 796 W 7350323 131072 zpool-abyss <none>
0 796 W 7350579 131072 zpool-abyss <none>
0 796 W 7351062 131072 zpool-abyss <none>
0 796 W 7351318 131072 zpool-abyss <none>
0 796 W 7351574 131072 zpool-abyss <none>
0 796 W 7352210 131072 zpool-abyss <none>
0 796 W 7352466 131072 zpool-abyss <none>
0 796 W 7352722 131072 zpool-abyss <none>
0 796 W 7348598 6144 zpool-abyss <none>
0 796 W 7348611 1024 zpool-abyss <none>
0 796 W 7348617 10752 zpool-abyss <none>
0 796 W 7352978 131072 zpool-abyss <none>
0 796 W 7353234 131072 zpool-abyss <none>
0 796 W 7353490 131072 zpool-abyss <none>
0 796 W 7353746 131072 zpool-abyss <none>
0 796 W 7354002 131072 zpool-abyss <none>
0 796 W 7354258 131072 zpool-abyss <none>
0 796 W 7354514 131072 zpool-abyss <none>
0 796 W 7354770 131072 zpool-abyss <none>
0 796 W 7355026 131072 zpool-abyss <none>
0 796 W 7355282 131072 zpool-abyss <none>
0 796 W 7355538 131072 zpool-abyss <none>
0 796 W 7355794 131072 zpool-abyss <none>
0 796 W 7356050 131072 zpool-abyss <none>
0 796 W 7356306 131072 zpool-abyss <none>
0 796 W 7356562 131072 zpool-abyss <none>
0 796 W 7356818 131072 zpool-abyss <none>
0 796 W 7357074 131072 zpool-abyss <none>
0 796 W 7357330 131072 zpool-abyss <none>
0 796 W 7357586 131072 zpool-abyss <none>
0 796 W 7357842 131072 zpool-abyss <none>
0 796 W 7358098 131072 zpool-abyss <none>
0 796 W 7358354 131072 zpool-abyss <none>
0 796 W 7358610 131072 zpool-abyss <none>
0 796 W 7358866 131072 zpool-abyss <none>
0 796 W 7359122 131072 zpool-abyss <none>
0 796 W 7359378 131072 zpool-abyss <none>
0 796 W 7359634 131072 zpool-abyss <none>
0 796 W 7359890 131072 zpool-abyss <none>
0 796 W 7360146 131072 zpool-abyss <none>
0 796 W 7360402 131072 zpool-abyss <none>
0 796 W 7360658 131072 zpool-abyss <none>
0 796 W 7360914 131072 zpool-abyss <none>
0 796 W 7361170 131072 zpool-abyss <none>
0 796 W 7361426 131072 zpool-abyss <none>
0 796 W 7361682 131072 zpool-abyss <none>
0 796 W 7361938 131072 zpool-abyss <none>
0 796 W 7362194 131072 zpool-abyss <none>
0 796 W 7362450 131072 zpool-abyss <none>
0 796 W 7362706 131072 zpool-abyss <none>
0 796 W 7362962 131072 zpool-abyss <none>
0 796 W 7363218 131072 zpool-abyss <none>
0 796 W 7363474 131072 zpool-abyss <none>
0 796 W 7363730 131072 zpool-abyss <none>
0 796 W 7363986 131072 zpool-abyss <none>
0 796 W 7364242 131072 zpool-abyss <none>
0 796 W 7364498 131072 zpool-abyss <none>
0 796 W 7364754 131072 zpool-abyss <none>
0 796 W 7365010 131072 zpool-abyss <none>
0 796 W 7365266 131072 zpool-abyss <none>
0 796 W 7365522 131072 zpool-abyss <none>
0 796 W 7365778 131072 zpool-abyss <none>
0 796 W 7366034 131072 zpool-abyss <none>
0 796 W 7366290 131072 zpool-abyss <none>
0 796 W 7366546 131072 zpool-abyss <none>
0 796 W 7366802 131072 zpool-abyss <none>
0 796 W 7367058 131072 zpool-abyss <none>
0 796 W 7367314 131072 zpool-abyss <none>
0 796 W 7367570 131072 zpool-abyss <none>
0 796 W 7367826 131072 zpool-abyss <none>
0 796 W 7368082 131072 zpool-abyss <none>
0 796 W 7368338 131072 zpool-abyss <none>
0 796 W 7368594 131072 zpool-abyss <none>
0 796 W 7368850 131072 zpool-abyss <none>
0 796 W 7369106 131072 zpool-abyss <none>
0 796 W 7369362 131072 zpool-abyss <none>
0 796 W 7369618 131072 zpool-abyss <none>
0 796 W 7369874 131072 zpool-abyss <none>
0 796 W 7370130 131072 zpool-abyss <none>
0 796 W 7370386 131072 zpool-abyss <none>
0 796 W 7370642 131072 zpool-abyss <none>
0 796 W 7370898 131072 zpool-abyss <none>
0 796 W 7371154 131072 zpool-abyss <none>
0 796 W 7371410 131072 zpool-abyss <none>
0 796 W 7371666 131072 zpool-abyss <none>
0 796 W 7371922 131072 zpool-abyss <none>
0 796 W 7372178 131072 zpool-abyss <none>
0 796 W 7372434 131072 zpool-abyss <none>
0 796 W 7372690 131072 zpool-abyss <none>
0 796 W 7372946 131072 zpool-abyss <none>
0 796 W 7373202 131072 zpool-abyss <none>
0 796 W 32514581 1024 zpool-abyss <none>
0 796 W 32514585 1024 zpool-abyss <none>
0 796 W 32514591 1024 zpool-abyss <none>
0 796 W 32514616 4096 zpool-abyss <none>
0 796 W 32514631 1024 zpool-abyss <none>
0 796 W 32514639 9728 zpool-abyss <none>
0 796 W 7348638 512 zpool-abyss <none>
0 796 W 7348639 512 zpool-abyss <none>
0 796 W 32514659 512 zpool-abyss <none>
0 796 W 32514658 512 zpool-abyss <none>
0 796 W 7348640 512 zpool-abyss <none>
0 796 W 32514660 512 zpool-abyss <none>
0 796 W 7348649 512 zpool-abyss <none>
0 796 W 32514669 512 zpool-abyss <none>
0 796 W 58728609 512 zpool-abyss <none>
0 796 W 7348643 3072 zpool-abyss <none>
0 796 W 7348641 1024 zpool-abyss <none>
0 796 W 32514661 4096 zpool-abyss <none>
0 796 W 58728616 1024 zpool-abyss <none>
0 796 W 58728622 3072 zpool-abyss <none>
0 0 R 7352192 65536 sched <none>
0 0 R 11557632 65536 sched <none>
0 796 W 7348654 1024 zpool-abyss <none>
0 796 W 32514674 1024 zpool-abyss <none>
0 796 W 7348658 1024 zpool-abyss <none>
0 796 W 58728628 1024 zpool-abyss <none>
0 796 W 7348643 5632 zpool-abyss <none>
0 796 W 7348660 8704 zpool-abyss <none>
0 796 W 32514663 5632 zpool-abyss <none>
0 796 W 32514676 1024 zpool-abyss <none>
0 796 W 32514680 8704 zpool-abyss <none>
0 796 W 58728609 512 zpool-abyss <none>
0 796 W 58728622 3072 zpool-abyss <none>
0 796 W 58728634 4096 zpool-abyss <none>
0 796 W 58728671 3584 zpool-abyss <none>
0 796 W 58728737 4096 zpool-abyss <none>
0 796 W 7348660 1024 zpool-abyss <none>
0 796 W 7348641 1024 zpool-abyss <none>
0 796 W 32514661 1024 zpool-abyss <none>
0 796 W 32514680 1024 zpool-abyss <none>
0 796 W 7348643 3584 zpool-abyss <none>
0 796 W 7348664 6656 zpool-abyss <none>
0 796 W 32514663 3584 zpool-abyss <none>
0 796 W 32514684 6656 zpool-abyss <none>
0 796 W 58728609 512 zpool-abyss <none>
0 796 W 58728616 1024 zpool-abyss <none>
0 796 W 58728622 3072 zpool-abyss <none>
0 796 W 58728636 1024 zpool-abyss <none>
0 796 W 58728640 1024 zpool-abyss <none>
0 796 W 58728671 3584 zpool-abyss <none>
0 796 W 58728741 2048 zpool-abyss <none>
0 796 W 260 1024 zpool-abyss <none>
0 796 W 772 1024 zpool-abyss <none>
0 796 W 156230404 1024 zpool-abyss <none>
0 796 W 156230916 1024 zpool-abyss <none>
Here's the mv:
./iosnoop
UID PID D BLOCK SIZE COMM PATHNAME
0 796 W 7348677 512 zpool-abyss <none>
0 796 W 32514697 512 zpool-abyss <none>
0 796 W 7348686 2048 zpool-abyss <none>
0 796 W 32514706 2048 zpool-abyss <none>
0 796 W 7348678 1536 zpool-abyss <none>
0 796 W 32514698 1536 zpool-abyss <none>
0 796 W 7348704 512 zpool-abyss <none>
0 796 W 32514722 512 zpool-abyss <none>
0 796 W 7348700 1024 zpool-abyss <none>
0 796 W 32514720 1024 zpool-abyss <none>
0 796 W 7348681 2560 zpool-abyss <none>
0 796 W 7348690 5120 zpool-abyss <none>
0 796 W 32514701 2560 zpool-abyss <none>
0 796 W 32514710 5120 zpool-abyss <none>
0 796 W 7348705 512 zpool-abyss <none>
0 796 W 7348706 512 zpool-abyss <none>
0 796 W 32514726 512 zpool-abyss <none>
0 796 W 32514723 512 zpool-abyss <none>
0 796 W 7348707 512 zpool-abyss <none>
0 796 W 32514727 512 zpool-abyss <none>
0 796 W 7348716 512 zpool-abyss <none>
0 796 W 32514736 512 zpool-abyss <none>
0 796 W 58728689 512 zpool-abyss <none>
0 796 W 7348710 3072 zpool-abyss <none>
0 796 W 7348708 1024 zpool-abyss <none>
0 796 W 32514728 4096 zpool-abyss <none>
0 796 W 58728642 1024 zpool-abyss <none>
0 796 W 58728678 3072 zpool-abyss <none>
0 796 W 7348721 1536 zpool-abyss <none>
0 796 W 7348724 1024 zpool-abyss <none>
0 796 W 32514741 1536 zpool-abyss <none>
0 796 W 58728690 1536 zpool-abyss <none>
0 796 W 7348717 2048 zpool-abyss <none>
0 796 W 7348726 8192 zpool-abyss <none>
0 796 W 32514737 2048 zpool-abyss <none>
0 796 W 32514744 9216 zpool-abyss <none>
0 796 W 7348716 512 zpool-abyss <none>
0 796 W 7348710 3072 zpool-abyss <none>
0 796 W 32514730 3584 zpool-abyss <none>
0 796 W 58728678 3072 zpool-abyss <none>
0 796 W 58728689 512 zpool-abyss <none>
0 796 W 58728693 1024 zpool-abyss <none>
0 796 W 58728697 1024 zpool-abyss <none>
0 796 W 58728745 5632 zpool-abyss <none>
0 796 W 58728761 3584 zpool-abyss <none>
0 796 W 7348708 1024 zpool-abyss <none>
0 796 W 7348742 1024 zpool-abyss <none>
0 796 W 32514762 1024 zpool-abyss <none>
0 796 W 32514728 1024 zpool-abyss <none>
0 796 W 7348710 3072 zpool-abyss <none>
0 796 W 7348716 512 zpool-abyss <none>
0 796 W 7348729 6656 zpool-abyss <none>
0 796 W 32514730 3584 zpool-abyss <none>
0 796 W 32514749 6656 zpool-abyss <none>
0 796 W 58728642 1024 zpool-abyss <none>
0 796 W 58728678 3072 zpool-abyss <none>
0 796 W 58728689 512 zpool-abyss <none>
0 796 W 58728697 1024 zpool-abyss <none>
0 796 W 58728752 2048 zpool-abyss <none>
0 796 W 58728761 4608 zpool-abyss <none>
0 796 W 7348708 1024 zpool-abyss <none>
0 796 W 7348744 1536 zpool-abyss <none>
0 796 W 32514764 1536 zpool-abyss <none>
0 796 W 32514728 1024 zpool-abyss <none>
0 796 W 7348710 3584 zpool-abyss <none>
0 796 W 7348729 6656 zpool-abyss <none>
0 796 W 32514730 3584 zpool-abyss <none>
0 796 W 32514749 6656 zpool-abyss <none>
0 796 W 58728642 1024 zpool-abyss <none>
0 796 W 58728678 3072 zpool-abyss <none>
0 796 W 58728697 1024 zpool-abyss <none>
0 796 W 58728752 2048 zpool-abyss <none>
0 796 W 58728761 3584 zpool-abyss <none>
0 796 W 58728770 1536 zpool-abyss <none>
0 796 W 58728689 512 zpool-abyss <none>
0 796 W 7348224 16384 zpool-abyss <none>
0 796 W 7348531 4096 zpool-abyss <none>
0 796 W 32514415 4096 zpool-abyss <none>
0 796 W 32514135 16384 zpool-abyss <none>
0 796 W 7348266 16384 zpool-abyss <none>
0 796 W 7348747 2048 zpool-abyss <none>
0 796 W 7348755 24576 zpool-abyss <none>
0 796 W 32514767 10240 zpool-abyss <none>
0 796 W 32514808 32768 zpool-abyss <none>
0 796 W 58728473 8192 zpool-abyss <none>
0 796 W 58728492 4096 zpool-abyss <none>
0 796 W 58728779 2048 zpool-abyss <none>
0 796 W 58728808 16384 zpool-abyss <none>
0 796 W 58728974 16384 zpool-abyss <none>
0 796 W 58729260 16384 zpool-abyss <none>
0 796 W 7348224 16384 zpool-abyss <none>
0 796 W 7348531 4096 zpool-abyss <none>
0 796 W 32514415 4096 zpool-abyss <none>
0 796 W 32514135 16384 zpool-abyss <none>
0 796 W 7348266 16384 zpool-abyss <none>
0 796 W 7348747 2048 zpool-abyss <none>
0 796 W 7348755 24576 zpool-abyss <none>
0 796 W 32514767 10240 zpool-abyss <none>
0 796 W 32514808 32768 zpool-abyss <none>
0 796 W 58728473 8192 zpool-abyss <none>
0 796 W 58728492 4096 zpool-abyss <none>
0 796 W 58728779 2048 zpool-abyss <none>
0 796 W 58728808 16384 zpool-abyss <none>
0 796 W 58728974 16384 zpool-abyss <none>
0 796 W 58729260 16384 zpool-abyss <none>
0 796 W 386 1024 zpool-abyss <none>
0 796 W 898 1024 zpool-abyss <none>
0 796 W 156230530 1024 zpool-abyss <none>
0 796 W 156231042 1024 zpool-abyss <none>
--
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