Cdrom drive access question

[Dean Fujioka]

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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