No devices found while creating a new XEN based linux VM in Red Hat Enterprise Linux 5.8

Issue

• Using the following command to create a guest:

# virt-install --name <vm-name> --ram <value> --disk path=/<path-to-img-file>,size=<size-in-GB>  --network network=default --location=<ISO-file location for installation>

• OR using the cdrom of the host directly:

# virt-install --name <vm-name> --ram <value> --disk path=/<path-to-img-file>,size=<size-in-GB>  --network network=default --cdrom /dev/cdrom

ERROR    Paravirtualized guests cannot install off cdrom media.

• Following errors were observed in the xend.log:

[2012-06-04 09:28:11 xend.XendDomainInfo 3999] DEBUG (XendDomainInfo:677) Checking for duplicate for uname: /virt/iso/rhel-server-5.8-x86_64-dvd.iso [file:/virt/iso/rhel-server-5.8-x86_64-dvd.iso], dev: xvdb, mode: r
[2012-06-04 09:28:11 xend 3999] DEBUG (blkif:27) exception looking up device number for xvdb: [Errno 2] No such file or directory: '/dev/xvdb'
[2012-06-04 09:28:11 xend 3999] DEBUG (blkif:27) exception looking up device number for xvdb: [Errno 2] No such file or directory: '/dev/xvdb'
[2012-06-04 09:28:11 xend 3999] DEBUG (DevController:133) DevController: writing {'virtual-device': '51728', 'device-type': 'disk', 'protocol': 'x86_64-abi', 'backend-id': '0', 'state': '1', 'backend': '/local/domain/0/backend/vbd/1/51728'} to /local/domain/1/device/vbd/51728.
[2012-06-04 09:28:11 xend 3999] DEBUG (DevController:135) DevController: writing {'domain': 'rhn01', 'frontend': '/local/domain/1/device/vbd/51728', 'format': 'raw', 'dev': 'xvdb', 'state': '1', 'params': '/virt/iso/rhel-server-5.8-x86_64-dvd.iso', 'mode': 'r', 'online': '1', 'frontend-id': '1', 'type': 'file'} to /local/domain/0/backend/vbd/1/51728.

• Getting following screen while using the above command:

Welcome to Red Hat Enterprise Linux Server




            +-----------------+ No driver found +------------------+
            |                                                      |
            |       Unable to find any devices of the type         |
            |       needed for this installation type.             |
            |       Would you like to manually select your         |
            |       driver or use a driver disk?                   |
            |                                                      |
            | +---------------+   +-------------------+  +------+  |
            | | Select driver |   | Use a driver disk |  | Back |  |
            | +---------------+   +-------------------+  +------+  |
            |                                                      |
            |                                                      |
            +------------------------------------------------------+





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