12.1, Dell 740 and the M2 SSD as boot media doesn't work

[George Michaelson]

On Thu, Dec 19, 2019 at 2:53 PM Eugene Grosbein <eugen at grosbein.net> wrote:
> You either switch the controller to "HBA" mode using its setup utility,
> or keep it in current "RAID" mode but configure your SSD as "Non-RAID" drive.

Tried HBA mode. Devices attached as AHCI were not recognized. Tried
leaving in RAID mode: cannot have two non_RAID devices. Its either one
(Raid) and one (non-Raid) or one RAID only.

Only one VD_ defined mirror pair in RAID mode was recognized after
boot by the ISO boot media.

Is it possible interrupting second stage boot to set hw.x.y.z=<val>
sysctl type settings would help? Something about device recognition?

>
> Also, you must use mrsas(4) driver instead of default mfi(4) to get TRIM support for SSD.
> mfi(4) has no TRIM support at all. You may switch to mrsas(4) after intallation, though.

Thanks for the tip!

-G