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From: "Emil A Eklund" <eae@eae.net>
To: "Karsten Fuhrmann" <karsten_fuhrmann@cartoon-film.de>,
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References: <40C998EF.4090607@cartoon-film.de>
Date: Fri, 11 Jun 2004 13:47:17 +0200
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Subject: Re: SCSI too slow
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The 29160UW adapter has two internal lvd connectors, only one of those
supports Ultra-160, the other one is provided for older equipment, since a
SCSI chain will only operate as fast as the slowest device on it. Therefor
make sure that the devices that supports Ultra-160 (or Ultra 2 Wide if thats
what you have) is on the Ultra-160 connector, while the slower devices is on
the other. If my memory is not failing me the Ultra-160 connector is the one
to the left.

Also, check your SCSI Bios, it has some speed related settings.

/Emil A Eklund (eae@eae.net)


----- Original Message ----- 
From: "Karsten Fuhrmann" <karsten_fuhrmann@cartoon-film.de>
To: <freebsd-questions@freebsd.org>
Sent: Friday, June 11, 2004 13:35
Subject: SCSI too slow


> Hello,
> i am using a Adaptec 29160UW Controller in my FreeBSD 4.8 Box together
> with an Easyraid 2 external RAID System and a Quantum SDLT-320 Drive.
> The problem is the data transfer Rate of my SCSI Channel is only 40
> Mbytes/s.
>
> dmesg shows
> da0: <easyRAID II > Fixed Direct Access SCSI-2 device
> Jun  8 16:17:17 stern /kernel: da0: 40.000MB/s transfers (20.000MHz,
> offset 31, 16bit), Tagged Queueing Enabled
>
> Is there a way to change the transfer rate somehow, because at least my
> SDLT is an ultra wide SCSI (LVD/SE)
>
> Cheers,
> karsten
>
>
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