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Date:      Thu, 1 Aug 2013 14:31:11 -0600
From:      "Kenneth D. Merry" <>
To:        Dan Langille <>
Subject:   Re: ahc0 cannot see attached devices
Message-ID:  <>
In-Reply-To: <>
References:  <>

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On Thu, Aug 01, 2013 at 15:48:13 -0400, Dan Langille wrote:
> I am in the process of moving a tape library from one server to another. 
> The old server is running FreeBSD 8.4-RELEASE and using:
> ahc0: <Adaptec 2944 Ultra SCSI adapter> port 0xa800-0xa8ff mem 0xfb7df000-0xfb7dffff irq 20 at device 5.0 on pci1
> The new server is running FreeBSD 9.1-RELEASE-p4 and using:
> ahc0: <Adaptec 2940B Ultra2 SCSI adapter> port 0xe800-0xe8ff mem 0xfebdf000-0xfebdffff irq 21 at device 3.0 on pci4

IIRC, the 2944 is a HVD (High Voltage Differential) card.  The 2940 is a
single ended or LVD card.  You can't connect HVD SCSI devices to a non-HVD

> While the new server boots, I don't see an Adaptec card BIOS prompt / mention pass by on the console.   Is this the first problem to solve?

That is somewhat curious, but what you really need is an HVD card in your
new server.

> If I detach the tape library and attach it to the old server, I do see the expect results (the following paste is missing non-tape related results):
> <QUANTUM DLT8000 0250>             at scbus12 target 4 lun 0 (sa1,pass12)
> <OVERLAND LXB 0524>                at scbus12 target 6 lun 0 (pass14,ch1)

Kenneth Merry

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