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Re: [Xen-users] HVM phy: disks not working; file: disks no problem

To: "John Morris" <jman@xxxxxxxxxxx>
Subject: Re: [Xen-users] HVM phy: disks not working; file: disks no problem
From: "Mark Walkom" <markwalkom@xxxxxxxxx>
Date: Fri, 19 Dec 2008 15:57:51 +1100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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No worries :)

2008/12/19 John Morris <jman@xxxxxxxxxxx>
Holy moly, that did the trick!  Thanks!


Mark Walkom wrote:
In my experience I've always used full paths to the LV, so;
 disk =  [ 'phy:/dev/domU/w2k30.root,hda,w' ]

It's worked for me.

2008/12/19 John Morris <jman@xxxxxxxxxxx <mailto:jman@xxxxxxxxxxx>>

   CentOS 5.2 dom0 w/fairly recent updates on x86_64, xen 3.2.0 RPM
   from xensource recompiled for x86_64, Win 2k3 domU (with GPL PV

   With HVM, phy: disks on LVs won't work, although the same host has
   many PV CentOS hosts running no problem from LVs.  The file: disks
   work with no problems.  The disk configurations I've tried:

   Neither works:
     disk =  [ 'phy:domU/w2k30.root,ioemu:hda,w' ]
     disk =  [ 'phy:domU/w2k30.root,hda,w' ]

     Selected logs:
     [2008-12-19 12:00:11 3365] INFO (XendDomainInfo:1504)
   createDevice: vbd : \
         {'uuid': 'dada2695-5fdd-85c9-3990-8d1978a35782', 'bootable':
   1, 'driver': 'ioemu', \
         'dev': 'ioemu:hda', 'uname': 'phy:domU/w2k30.root', 'mode': 'w'}
     [2008-12-19 12:00:12 3365] INFO (XendDomainInfo:1273) Domain has
   shutdown: name=w2k30 id=63 reason=poweroff.

     disk  =  [ 'file:/d/distro.w2k3/w2k30.root,hda,w', ]
     disk  =  [ 'tap:aio:/d/distro.w2k3/w2k30.root,hda,w' ]

     Selected logs:
     [2008-12-19 12:05:15 3365] INFO (XendDomainInfo:1504)
   createDevice: tap : \
         {'bootable': 1, 'uname':
   'tap:aio:/d/distro.w2k3/w2k30.root', 'mode': 'w', 'dev': '\
         hda', 'uuid': 'ee5b79fa-2286-dcab-9864-21af8fce8a8e'}

   With the phy: disk, the host will begin to boot, but then
   immediately shut down.  The phy: disk image was created by dding
   the file from the installed file: image into the blank phy: LV.

   If booted from the win2k3 install CD (cdrom specified as file:,
   disk as phy:), the install hangs forever at "Setup is starting
   Windows", presumably as it's trying to grok the hard drive

   I managed to get the domain to pause during the Plex86/Bocks Bios,
   and see the disk detection as follows:
     ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (   0 MBytes)
     ata0  slave: Unknown device

     Booting from Hard Disk...

   At this point the domain shuts down.

   More information:

     [root@xen-3 distro.w2k3]# lvs /dev/domU/w2k30.root
       LV         VG   Attr   LSize Origin Snap%  Move Log Copy%  Convert
       w2k30.root domU -wi-a- 5.19G
     [root@xen-3 distro.w2k3]# fdisk -l /dev/domU/w2k30.root

     Disk /dev/domU/w2k30.root: 5570 MB, 5570035712 bytes
     255 heads, 63 sectors/track, 677 cylinders
     Units = cylinders of 16065 * 512 = 8225280 bytes

                    Device Boot      Start         End      Blocks      Id  System
     /dev/domU/w2k30.root1   *           1         660     5301418+      7  HPFS/NTFS

   Complete config file follows.  Let me know what else I can provide
   to debug this problem.  Thanks-


   # xen configfile for host w2k30.bt1.ablesky.com

   # use 'xm create w2k30 mode=install' to boot from w2k3 install CD
   name = "w2k30"
   memory = 1024  # memory for normal operation
   shadow_memory = 8
   # disks
   #disk =  [ 'phy:domU/w2k30.root,ioemu:hda,w', ]
   #disk  =  [ 'file:/d/distro.w2k3/w2k30.root,hda,w', ]
   disk  =  [ 'tap:aio:/d/distro.w2k3/w2k30.root,hda,w' ]
   # network interfaces
   vif = [ "mac=00:16:ee:a8:c8:26, type=ioemu, bridge=btbr,
   model=e100", ]
   kernel = "/usr/lib64/xen/boot/hvmloader"
   builder = "hvm"
   device_model = "/usr/lib64/xen/bin/qemu-dm"
   sdl = 0
   vnc = 1
   vnclisten = ""
   vncdisplay = 1
   vncconsole = 1
   vncunused = 0
   vncpasswd = ""
   nographic = 0
   stdvga = 0
   serial = 'pty'
   # test if mode variable is defined
   except NameError:
     mode = 'normal'
   if mode not in ('install','reinstall'):
         # this is for after install
         boot = 'c'
         on_reboot   = 'restart'
         on_crash    = 'restart'
         # these are for install
         disk = [
   ] + \
         boot        = 'd'
         on_reboot   = 'destroy'
         on_crash    = 'destroy'

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John Morris
Vice President, Asia-Pacific Region
AbleSky, Inc.
+86-10-8885-5525 ext. 102 (Beijing, China) 1-650-694-7960 ext. 102 +(Mountain View, CA)

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