[conspire] (forw) Re: June 25 MP installfest upgrade RH 7.3 PC to Centos56 continuation

[Ruben Safir]

On 07/08/2011 08:57 PM, Rick Moen wrote:
> ----- Forwarded message from Rick Moen<rick at linuxmafia.com>  -----
>
> Date: Fri, 8 Jul 2011 17:55:54 -0700
> From: Rick Moen<rick at linuxmafia.com>
> To: wood eddie<ewood111 at yahoo.com>
> Subject: Re: June 25 MP installfest upgrade RH 7.3 PC to Centos56
> 	continuation
> Organization: If you lived here, you'd be $HOME already.
>
> Quoting wood eddie (ewood111 at yahoo.com):
>
> I had to think for a minute, to imagine why you would end up with both
> narrow-SCSI and wide-SCSI devices.  Then, I remembered that you wrote:
>
>> Had to use SCSI CDROM as terminator for now.
> Wow, a SCSI CD-ROM drive.  That's... how can I put this?  Let me try to
> put it this way.  On the one hand, you already own it, and it presumably
> works, so I can understand your wanting to use it.  On the other hand,
> SCSI-type optical drives were never very practical, and you might be
> best advised to just retire it and replace it with a dirt-cheap
> PATA-type or USB-type CD/DVD drive or even a CD/DVD burner.
>
> Why?  First, they're so cheap you really lose little, and they'll be far
> more useful, far faster, and have long service lives ahead of them.  And
> also, you'll no longer need to take special measures to accomodate a
> _single_ narrow-SCSI device in addition to your two wide-SCSI hard
> drives and one wide-SCSI Adaptec controller.  Which is a bit of hassle
> that goes away if everything on the SCSI chain is wide-type.
>
> Or, err... I just realised, your Adaptec controller _isn't_ wide-SCSI,
> is it?  Oh, err....
>
> I may owe you an apology about advising you to get an Adaptec AHA-2940.

2940 UW

http://www.adaptec.com/en-us/support/scsi/2940/aha-2940uw/


> I really meant 'Whatever's the appropriate card in the 2940 family, that
> best suits what you need to run on it.' It's been so long since I bought
> one, I forgot that a _literal_ model AHA-2940 card is strictly a
> narrow-SCSI (8-bit bus) card.  I really wasn't stopping to think about
> whether you had narrow or wide SCSI hard drives -- but perhaps can be
> forgiven because your gear wasn't in front of me.
>
> Adaptec's 2940 family includes later models like AHA-2940UW, where the 'U'
> suffix stands for 'Ultra-SCSI', a marketing term for 20 megatransfers
> per second, and 'W' stands for wide, or 2-bytes wide per transfer, and
> therefore 2 x 20 = 40 megabytes per second capacity for data on the SCSI
> bus.  An AHA-2940UW has both a 50-pin narrow-SCSI connector and a 68-pin
> wide-SCSI one.
>
>
> ----- End forwarded message -----
>
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