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

Hi Keir and Mats,

When I booted into native RHEL4.4, /dev/cdrom is linked to hda. My CD-ROM is the only IDE device and my OS hard disk is the SATA. When I booted into Xen(on the same platform with the same distribution) I can NOT find ANY hd* device under /dev/ (SATA hard disk is listed correctly though). So what Mats said does not apply here. Could this be a bug for Xen 3.0.3?

Best regards,


----- Original Message ----- From: "Keir Fraser" <keir@xxxxxxxxxxxxx> To: "Liang Yang" <multisyncfe991@xxxxxxxxxxx>; "Petersson, Mats" <Mats.Petersson@xxxxxxx>; <xen-devel@xxxxxxxxxxxxxxxxxxx>
Cc: <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Friday, December 01, 2006 9:44 AM
Subject: Re: [Xen-devel] Re: [Xen-users] Can not find the cdrom device in /dev/ after booted into xen(3.0.3)

On 1/12/06 16:38, "Liang Yang" <multisyncfe991@xxxxxxxxxxx> wrote:

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?

When you boot native RHEL4.4, what is /dev/cdrom a symlink to? You should
try using the target of the symlink as the physical device target in your
HVM config file. If the target of the symlink also does not exist when
running on Xen then it is likely that your XenLinux kernel does not include
an appropriate driver for your CDROM device. Perhaps it is a SATA drive
connected to a SATA chipset for which our kernel does not have a driver?

-- Keir

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