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From: Matthew Jacob <mj@feral.com>
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Cc: "Kenneth D. Merry" <ken@freebsd.org>, FreeBSD-SCSI <scsi@freebsd.org>
Subject: Re: mpt(4) cuts 3TiB drives down to 2TiB
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>> I have heard from a friend (i.e. I haven't personally confirmed) that the
>> capacity truncation only applies to SATA drives.  If you attach a 3TB SAS
>> drive, you should be able to see the full capacity.
>> 
>
> I can't confirm either since I have no 3TB SAS drives currently.

Target mode. Try a linux box with SCST.