From owner-freebsd-scsi@FreeBSD.ORG  Wed Mar 31 00:41:20 2004
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Date: Wed, 31 Mar 2004 00:42:49 -0800 (PST)
From: Tom <tom@sdf.com>
To: Nick Twaddell <nick@webspacesolutions.com>
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Subject: Re: Raid drive speeds
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On Tue, 30 Mar 2004, Nick Twaddell wrote:

> I just connected to maxtor atlas 15k 73gig drives to my adaptec 2120S
> controller.  On boot this is what it says
>
> pass0: <F6C6OR ATLAS15K_73SCA DSE2> Fixed unknown SCSI-3 device
> pass0: 160.000MB/s transfers (80.000MHz, offset 127, 16bit)
> pass1 at aacp0 bus 0 target 1 lun 0
> pass1: <8737OR ATLAS15K_73SCA DP60> Fixed unknown SCSI-3 device
> pass1: 26.400MB/s transfers (64bit)
>
> Why does it say one drive is 160MB transfers, and the other is 26.400MB
> transfers.  Both drives are ultra320 and they seem to show up as ultra320 in
> the adaptec bios?

  I find it strange that the pass-through driver is even probing disks for
you.  The RAID controller typically hides physical disk from the OS.

Tom