23 September 2020
SAS drives larger than 2TB are allowed and this drive is on the compatibility list. But I wonder if you have an untested configuration? That is, I don't know if testing was done with both SAS and SATA drives used at the same time. We have never shipped a subsystem with a mixed configuration and this is the first time I've seen it used.
To test this, power down the Ex10 and unseat all the SATA drives, then power up the system and see if the SAS drives show correctly. I suspect that the OK, not usable is caused by the firmware assuming they have AAMUXes and seeing that they are over 2TB, which is impossible with an AAMUX. This is speculation on my part.
Another speculation is that if they see the SAS drives first, then perhaps this will fix the problem, that is, maybe swapping the SAS and SATA drives will help?