#595 Issue closed: failed to restore backup iso for Xen VM¶
Labels: support / question
kelwoo opened issue at 2015-06-09 04:19:¶
Hi All,
I could seccessfully created ISO backup of VM in XEN and send to NFS repos. but when I try to restore the VM.
I encountered some problem and failed to restore VM eventaully,
- When I tried to create a new VM (for restoration), If I select VM type as "CentOS / RHEL", I cannot startup the newly created ISO that for restoration
- When I tried to create a new VM and select "other" type, I could restore the VM but failed to boot the recovered VM
The ISO backup and recover works perfectly under VMware
it said that there is problem in disk xvdsk/dsk convertion. I could not find any troubleshoot info from google or here. Is it only encountered by me? Anyone can help?
schlomo commented at 2015-06-09 06:18:¶
When choosing "CentOS/RHEL" as the VM type you probably configured a paravirtualized VM (PVM) which to the best of my knowledge cannot boot an ISO.
Do you have a screenshot? The recovery log?
abbbi commented at 2015-06-09 11:33:¶
Hi,
yes, if you create a VM with the template for the operating systems in
use, they are allways Paravirtualized. I dont know wether if it is
possible to boot a ISO image which already includes
a XEN PV kernel. We have asked the citrix guys about this but not yet
got any answer:
http://discussions.citrix.com/topic/365604-how-to-boot-a-paravirtualized-kernel-off-an-cdrom-image/
I think it might work if you convert the ISO Image to a Virtual Disk,
and then set the PV-Kernel
and PV-Bootloader options accordingly. Other than that i think the only
solution is to boot the
kernel from the network.
One existing workaround is to install a regular kernel within the
virtual machine besides the xen
kernel and start rear mkrescue with the -r option, passing the kernel
verison which is not a xen
PV kernel.
Then you can at least boot the iso image with the "other install media"
option which is a HVM
virtual machine. After recovery the Virtual machine has to be converted
to PV again.
jsmeix commented at 2016-09-28 13:42:¶
No further comments since more than one year
indicate that this issue has become outdated
so that I like to close it now.
If needed it could be reopened but preferably
file a new issue based on a current rear version.
In general regarding XEN and paravirtualization
you may have a look at the section about
"Virtual machines" in
https://en.opensuse.org/SDB:Disaster_Recovery
[Export of Github issue for rear/rear.]