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OS Ubuntu '16.04.5 LTS'

Hypervisor Xen

This output is when sda

 df -h
 Filesystem      Size  Used Avail Use% Mounted on
 udev             16G  4.0K   16G   1% /dev
 tmpfs           3.2G  1.3M  3.2G   1% /run
 /dev/sda1       792G  9.7G  742G   2% /
 none            4.0K     0  4.0K   0% /sys/fs/cgroup
 none            5.0M     0  5.0M   0% /run/lock
 none             16G  144K   16G   1% /run/shm
 none            100M   32K  100M   1% /run/user

When xvda

 Filesystem      Size  Used Avail Use% Mounted on
 udev             16G  4.0K   16G   1% /dev
 tmpfs           3.2G  1.3M  3.2G   1% /run
 /dev/xvda1       792G  32G  721G   5% /
 none            4.0K     0  4.0K   0% /sys/fs/cgroup
 none            5.0M     0  5.0M   0% /run/lock
 none             16G  144K   16G   1% /run/shm
 none            100M   32K  100M   1% /run/user
 none            16G    1.3M 16G   1% /tmp/guest-9tjKZL

After Multiple reboots it will comeup with xvda,

I can find these messages in syslogs file

Oct 25 18:43:00 abcd kernel: [    0.000000] Hypervisor detected: Xen HVM
Oct 25 18:43:00 abcd kernel: [    0.000000] Xen version 4.1.
Oct 25 18:43:00 abcd kernel: [    0.000000] Xen Platform PCI: I/O protocol version 1
Oct 25 18:43:00 abcd kernel: [    0.000000] Netfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated NICs.
Oct 25 18:43:00 abcd kernel: [    0.000000] Blkfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated disks.
Oct 25 18:43:00 abcd kernel: [    0.000000] You might have to change the root device
Oct 25 18:43:00 abcd kernel: [    0.000000] from /dev/hd[a-d] to /dev/xvd[a-d]
Oct 25 18:43:00 abcd kernel: [    0.000000] in your root= kernel command line option
Oct 25 18:43:00 abcd kernel: [    0.000000] HVMOP_pagetable_dying not supported

closed as unclear what you're asking by dirkt, RalfFriedl, Jeff Schaller, Archemar, jimmij Oct 28 '18 at 22:51

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • Please edit your question and ask an actual question. If it doesn't work with /dev/sda, but works with /dev/xvda. and the question is "what should I do", why don't you change the root device as suggested in the syslog? – dirkt Oct 27 '18 at 8:05
  • can you plz share how can I change to xvda? – Hulk711 Oct 28 '18 at 16:53
  • man bootparam, look for root=, as mentioned in the message... – dirkt Oct 28 '18 at 19:00

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