[Xen-devel] Re: [Xen-users] Can not find the cdrom device in /dev/ after booted into xen(3.0.3)

["Liang Yang" <multisyncfe991@xxxxxxxxxxx>]

Hi Mats,

Thanks for your reply. I still have two questions:
1. Your answer still does not explain why Linux native listed the CD-ROM 
device as /dev/cdrom while Xen Linux (using the same distribution, i.e. RHEL 
Server 4.4) does not.
2. If I want to install HVM Linux from CDROM instead of file image, how can 
I define the cdrom in .hvm file:
disk = [ 'phy:/dev/sdb,hda,w', 'phy:/dev/cdrom,hdc:cdrom,r' ] will not work 
as /dev/cdrom is not available. Then I tried disk = [ 'phy:/dev/sdb,hda,w', 
'phy:/dev/hdc,hdc:cdrom,r' ]. It still does not work as /dev/hdc is not 
available either.
How can I create /dev/hdc for my cd-rom?

Regards,

Liang

----- Original Message ----- 
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
To: "Liang Yang" <multisyncfe991@xxxxxxxxxxx>; 
<xen-devel@xxxxxxxxxxxxxxxxxxx>
Cc: <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Friday, December 01, 2006 9:22 AM
Subject: RE: [Xen-users] Can not find the cdrom device in /dev/ after booted 
into xen(3.0.3)



> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Liang Yang
> Sent: 01 December 2006 16:12
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Can not find the cdrom device in /dev/
> after booted into xen(3.0.3)
>
> Hello,
>
> I just did a fresh installation of Xen 3.0.3. However, I can
> not find my
> cd-rom device under /dev/ after I booted into Xen. If I
> booted into Linux
> native (RHELAS 4.4), CD-ROM device is there and listed as
> /dev/cdrom. I know
> Xen changed the CD-ROM access mode from HVM domain. But for
> Xen domain0, it
> should still be listed as /dev/cdrom, right?
/dev/cdrom is a "link" to the actual /dev/[sh]d[abcd] device that is the
CDROM drive. As far as I understand, it's normally created by the
distributions initrd. You may be able to disassemble your distributions
initrd and find the line that creates this link - but the fact is that
different distributions do this slightly differently.

Much easier to just use /dev/[sh]d[abcd] for your cdrom.

--
Mats
> I think the driver for CD-ROM must be already loaded and it
> is hided by Xen
> somehow. I checked a Linux Server beta version which has
> integrated Xen on
> the same platform, I can find the cdrom device in /dev/. I
> remember Xen
> 3.0.2 does not have this problem either.
>
> Could anyone share some solutions?
>
> Thanks,
>
> Liang
>
>
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> Xen-users@xxxxxxxxxxxxxxxxxxx
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