I did the test with the disks in singledisk and this what I found in my case. If I move over 3 disks in raidz everything was ok. But if I did the same with 4 disks in raidz2 the volume will not mount. Here is the devlist… hopefully will show in readable format. If I have time will repeat in JBOD tomorrow.
devlist with 9650 card in singledisk
[root@freenas ~]# camcontrol devlist
<AMCC 9650SE-12M DISK 4.10> at scbus0 target 0 lun 0 (da0,pass0)
<AMCC 9650SE-12M DISK 4.10> at scbus0 target 1 lun 0 (da1,pass1)
<AMCC 9650SE-12M DISK 4.10> at scbus0 target 2 lun 0 (da2,pass2)
<ST980811AS 3.CDE> at scbus3 target 0 lun 0 (ada0,pass3)
[root@freenas ~]#
devlist straight to board
[root@freenas ~]# camcontrol devlist
<ST980811AS 3.CDE> at scbus2 target 0 lun 0 (ada0,pass0)
<HDS725050KLA360 K2AOAB5A> at scbus3 target 0 lun 0 (ada1,pass1)
<Hitachi HUA721050KLA330 GK6OA74A> at scbus4 target 0 lun 0 (ada2,pass2)
<ST3500410AS CC34> at scbus5 target 0 lun 0 (ada3,pass3)
[root@freenas ~]#
Remember this is just a bunch of old hardware just for testing the 9650 card. This is not production or certified hardware.