Specifications

xm console [domain name or number]

Where domain100 represents a running name or number. You can also use the Virtual Machine

Manager to display the virtual text console. On the Virtual Machine Details window, select Serial

Console from the View menu.

8. Full Virtualization Guest Console Access

Full Virtualized guest operating systems automatically has a text console configured for use, but

the difference is the kernel guest is not configured. To enable the guest virtual serial console to

work with the Full Virtualized guest, you must modify the guest's grub.conf file, and include the

'console =ttyS0 console=tty0' parameter. This ensures that the kernel messages are sent

to the virtual serial console (and the normal graphical console). If you plan to use the virtual

serial console in a full virtualized guest, you must edit the configuration file in the /etc/xen/

directory. On the host domain, you can then access the text console by typing:

xm console

You can also use the Virtual Machine Manager to display the serial console. On the Virtual

Machine Details window, select Serial Console from the View menu.

9. Implementing Lun Persistence

If your system is not using multipath, you can use udev to implement lun persistence. Before

implementing lun persistence in your system, ensure that you acquire the proper UUIDs. Once

you aquire these, you can configure lun persistence by editing the scsi_id file that resides in

the /etc directory. Once you have this file open in a text editor, you must comment out this

line:

# options=-b

Then replace it with this parameter:

# options=-g

This tells udev to monitor all system SCSI devices for returning UUIDs. To determine the

system UUIDs, type:

# scsi_id -g -s /block/sdc

Chapter 18. Red Hat Virtualization Troubleshooting