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Re: How to enable a SCSI CD-ROM ?

From: Thomas Schwinge
Subject: Re: How to enable a SCSI CD-ROM ?
Date: Thu, 15 Sep 2011 17:59:49 +0200
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On Thu, 15 Sep 2011 17:17:58 +0200, "Thomas Schmitt" <scdbackup@gmx.net> wrote:
> Thomas Schwinge:
> But:
>   # dd if=/dev/sr0 count=1 bs=2048 skip=16 | strings
>   dd: opening `/dev/sr0': No such device or address

>   # devprobe sr0 || echo no
>   no

> But i see in /var/log/dmesg
>   [...]
>   Failed initialization of WD-7000 SCSI card!

Note that this is just *one* of the SCSI drivers printing something to
the console -- the others appear to simply stay silent.

> No SCSI card, so no SCSI CD-ROM ?

Correct, I would assume.

> man kvm on the hosting Debian amd64 does not tell much about SCSI
> other than examples how to set up emulated SCSI drives.

For example, you could boot a GNU/Linux system, and figure out which SCSI
devices exactly are provided.

> The message about CD-ROM at hd2 comes even if i submit no -cdrom to kvm.
> Trying to read it then yields
>   # dd if=/dev/hd2 count=1 bs=2048 skip=16 | strings 
>   dd: reading `/dev/hd2': Input/output error

Yes, in my understanding, that equals an empty CD-ROM tray.  The -cdrom
option specifies the image to use; if none, the tray is empty.

> > Also, there is a /dev/MAKEDEV script.
> This seems to have no case that matches device name "sr".

This should be fixed as soon as you got this working.


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