Cdrom drive access question

[MonMotha]

Oh, if you don't have a terminator at all on the chain, check to make 
sure that the last drive on the chain is terminating properly.  If not, 
you're operating a SCSI chain without ANY termination and this is never 
a good thing :)

--MonMotha

Dean Fujioka wrote:

> Jeffery,
> 
> I do not think I have an active terminator, you may well be correct. If
> memory serves me right, the active terminator is a little device you put on
> the end of the chain, right? I don't have one...but I only have two devices
> on a relatively short (I'll have to yank it out to measure its length)
> cable. BTW its one of those older 50 pin types.
> 
> thanks,
> 
> dean
> p.s. I have to go to class now and will not be able to respond till later.
> 
> 
> ----- Original Message -----
> From: "Jeffrey Wong" <jmwong at hoku.net>
> To: "Linux & Unix Advocates & Users" <luau at maile.hi.net>
> Sent: Tuesday, February 05, 2002 4:17 PM
> Subject: [luau] Re: Cdrom drive access question
> 
> 
> 
>>The periodic reading on your SCSI cdrom drive sounds like a SCSI bus
>>reset.  The last time I saw a system with frequent bus resets it turned
>>out to be a termination problem, so the first place I'd check is
>>there.  If you are using a passive terminator (unless it is actually
>>labeled as and active or force-perfect terminator its probably passive,
>>its the cheapest design), passive terminators only work reliably for
>>low speed scsi devices, and then only for a short scsi chain.  You might
>>consider getting an active terminator and trying that.  I believe IC
>>supply sells them for something like $30, and even if you don't need it,
>>I'd generally recomend it for any scsi system.  In any case, prolonged
>>usage of a badly terminated scsi chain can cause the controller to
>>become flaky, which may be whats causing your lockups.
>>
>>Jeff
>>
>>On Tue, 5 Feb 2002, Dean Fujioka wrote:
>>
>>
>>>Charles,
>>>Thanks for the reply.  Unfortunately my controller only has one
>>>
> interface,
> 
>>>which has the CDrom drive and a 100mb zip drive on it.  I have two hard
>>>drives, both IDE on the primary channel. My computer will now not boot
>>>
> into
> 
>>>linux very stably, and freezes causing me to run fsck manually over and
>>>
> over
> 
>>>again.  I've unplugged the cdrom and was able to dmesg, and got
>>>
> something
> 
>>>I/O error on sba 08:00 something or other. I can post it if you think it
>>>would help, but it might take some doing, as I'm having trouble just
>>>
> keeping
> 
>>>everything running at this point. I didn't get to check
>>>
> /var/log/messages
> 
>>>yet, but will try.
>>>thanks,
>>>dean
>>>
>>>
>>>----- Original Message -----
>>>From: <cpaul at telemetrybox.org>
>>>To: "Linux & Unix Advocates & Users" <luau at maile.hi.net>
>>>Sent: Tuesday, February 05, 2002 8:25 AM
>>>Subject: [luau] Re: Cdrom drive access question
>>>
>>>
>>>
>>>>If your SCSI controller has two interfaces, try putting your CDRom on
>>>>
> the
> 
>>>(slower) interface seperate from your Hard Drive.  Short of that, check
>>>
> your
> 
>>>/var/log/messages or dmesg to see if there are any periodic bus errors
>>>
> which
> 
>>>might be associated with your performance hiccups.
>>>
>>>>aloha,
>>>>charles
>>>>
>>>>
>>>>On Mon, Feb 04, 2002 at 10:43:31PM -1000, Dean wrote:
>>>>
>>>>>I was wondering if anyone has experienced issues with cdrom drives
>>>>>
> that
> 
>>>>>check for a cd every minute or so. Whenever this happens, the screen
>>>>>freezes temporarily and then comes back.  The thing is, though that
>>>>>
> only
> 
>>>>>the scsi cd-writer (yamaha 4x on a adaptec 2940AU) is having the
>>>>>problem, while the cdrom on the ide channel does not do this. Is
>>>>>
> there
> 
>>>>>any way to disable this? please point me to a man page or
>>>>>
> something...
> 
>>>>>just typing drives me nutz.
>>>>>
>>>>>thanks,
>>>>>dean
>>>>>
>>>>>
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