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From: Mark Blackman <mark@exonetric.com>
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To: Dillin Smith <dillinsmith@gmail.com>
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Subject: Re: Hard drive detection
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On 12 May 2011, at 20:34, Dillin Smith wrote:

> Hi all,
> 
>   I'm having an issue getting my installation of FreeBSD to detect all
> the drives in the system. It has 48 total, 46 2TB, and 2 250GB. The
> system consists of six controllers, with eight drives on each. The two
> 250GB hard drives are the first drives on controllers 0 and 1.
> 
>   There are two of these machines with the exact same configurations,
> having the same problem. A very odd thing is that every time the
> systems are rebooted, the drives that go undetected vary. Also, when
> the systems were full of 250GB drives, all were detected. All drives
> are detected in the BIOS of the controllers, just not by FreeBSD.
> Any and all help is greatly appreciated.
> (output of dmesg attached)

Power problems (i.e. under-rated PSU)? Staggered spin-up means they're
not all coming up quickly enough?

With a rig as complex as that, I'd boot up another OS, like Linux or Windows 
and see if they can see all the drives. 

- Mark