[98488] in RedHat Linux List
Re: Wanted, SCSI bus trick
daemon@ATHENA.MIT.EDU (Ray Abbitt)
Mon Nov 9 10:25:21 1998
Date: Mon, 9 Nov 1998 07:11:39 -0800 (PST)
From: Ray Abbitt <rabbitt@ncal.verio.com>
To: redhat-list@redhat.com
In-Reply-To: <364648E6.DD4ED86C@iea-software.com>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
On Sun, 8 Nov 1998, Dale E. Reed Jr. wrote:
> M. Neidorff wrote:
> >
> > >
> > >Which all makes me wonder if there is a way to "reboot" the SCSI adapter
> > >from inside Linux...
> > >
> > >Depending on who made your adapter and how well they support Linux this
> > >might be a good question for the manufacturer.
> >
It really doesn't matter who made the adapter or how well they support
Linux. Take a look at the man page for proc (search for scsi and you
will see how to scan for added devices). There is some more info in
the source for the scsi drivers, but I don't remember exactly where.
I believe there is also some info on this in the scsi How-To (or mini
How-to whichever it is).
> > this, I think that once the bus recoginzed its devices before os boot, you
> > can't add more devices. All scsi devices need to be on when the computer
> > is turned on.
>
> This is completley dependant on the SCSI controller. Most low end SCSI
> controllers do not support adding drives on the fly. If you have a high
> end card, it usually will support hot swap drives, which allow you to
> plug in a device device, turn it one, and have the SCSI Controller
> recognize it on its next rescan of the bus (usually configurable in the
> BIOS).
Wrong, wrong, wrong. It doesn't matter whether the SCSI controller
recognises a new device or not. The operating system has to know its
there too. (Go install NT on a Compaq server without Compaq's drivers
and watch it ignore hot-swappable drives). And yes there are usually
ways around this (I finally figured out how to make W95/98 re-scan
the SCSI bus so that I didn't have to have my scanner powered up at
boot time)
-ray
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