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Date:      Thu, 19 Dec 2019 15:35:37 +1000
From:      George Michaelson <ggm@algebras.org>
To:        Eugene Grosbein <eugen@grosbein.net>
Cc:        FreeBSD Stable <freebsd-stable@freebsd.org>
Subject:   Re: 12.1, Dell 740 and the M2 SSD as boot media doesn't work
Message-ID:  <CAKr6gn21n6B%2Bg3FEas9fkyeKp30V=fHW_h-Rt3rEEWfL%2BjHtYg@mail.gmail.com>
In-Reply-To: <983b9569-f968-156c-a773-0cc245569744@grosbein.net>
References:  <CAKr6gn1UCPH%2B0PoxHUnREB_CYsc7WkGn1UNe-RuU3Ymgr0BTHw@mail.gmail.com> <983b9569-f968-156c-a773-0cc245569744@grosbein.net>

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On Thu, Dec 19, 2019 at 2:53 PM Eugene Grosbein <eugen@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



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