Missing drives in GUI

[nromyn]

I've been running my FreeNAS environment for quite some time and I've never had a full listing of all the devices in the GUI. Any help would be appreciated. The system is "budget" but it is, generally, functional and reasonably stable. However, I can't convince TrueNAS to enable S.M.A.R.T for all my drives and that's a risk I'd like to avoid, and it's a bit concerning.

Drives show up just fine in /dev, camcontrol, and are responsive via smartctl. smartd.conf gets overwritten if I manually configure it unfortunately - that's, presently, my main concern. My USB hub comes up as /dev/da0 for some reason - and I bet that's part of my issue!

Code:

root@freenas:~ # camcontrol devlist
<Samsung SSD 750 EVO 250GB MAT01B6Q>  at scbus0 target 0 lun 0 (pass0,ada0)
<FORESEE 32GB SSD O0213E>          at scbus1 target 0 lun 0 (pass1,ada1)
<Generic- SD/MMC/MS PRO 1.00>      at scbus3 target 0 lun 0 (da0,pass2)
<WDC WD40 EFRX-68N32N0 0125>       at scbus4 target 0 lun 0 (da1,pass3)
<WDC WD40 EFRX-68WT0N0 0125>       at scbus4 target 0 lun 1 (da2,pass4)
<WDC WD40 EFRX-68WT0N0 0125>       at scbus4 target 0 lun 2 (da3,pass5)
<ST4000VN 000-1H4168 0125>         at scbus4 target 0 lun 3 (da4,pass6)
<WD Elements 25A3 1030>            at scbus5 target 0 lun 0 (da5,pass7)

Code:

root@freenas:~ # ls /dev/da?
/dev/da0        /dev/da1        /dev/da2        /dev/da3        /dev/da4        /dev/da5

Disks screenshot:

The pool in question:

Smart configuration doesn't make the disks available: