Re: [Xen-API] look into VHD VDI from Control Domain in XCP 1.6

[George Shuklin <george.shuklin@xxxxxxxxx>]

You doing it wrong.

Use xe vbd-create between vdi and dom0 (which is normal VM mostly), and 
xe vbd-plug.
You can see some sample usage in 'xe-edit-bootloader' command (somewhere 
in /opt/xensource/)
05.01.2013 04:57, Alexandre Kouznetsov ÐÐÑÐÑ:
> Hello.
>
> I'm trying to mount VM's disk within Control Domain, as part of my 
> pre-production tests. My XCP 1.6 installation uses a LVM based local 
> storage after a default install. The VM's disks are in VHD format.
> In my previous Xen experience, with "raw" volumes as virtual hard 
> disks, I have successfully used kpartx, with images stored in files 
> and LVM. Clearly, kpartx can't map partitions of a VHD volume.
> Within the XCP installation I have found vhdpartx utility, judging by 
> it's name and --help output I expected it to be just the tool I need. 
> But it's seems there is some problem if I try to use it as kpartx:
> [root@xcp47 ~]# lvscan
> ACTIVE '/dev/VG_XenStorage-cfc7419f-8b4e-8c51-d619-dfdee09841a2/MGT' 
> [4.00 MB] inherit
> ACTIVE 
> '/dev/VG_XenStorage-cfc7419f-8b4e-8c51-d619-dfdee09841a2/VHD-bbdf149e-4b41-4a6a-9059-9251365a0a86' 
> [8.02 GB] inherit
> ACTIVE 
> '/dev/VG_XenStorage-cfc7419f-8b4e-8c51-d619-dfdee09841a2/VHD-fd118da1-c3dd-466b-8b27-32c5db1fcce7' 
> [3.01 GB] inherit
> [root@xcp47 ~]# vhdpartx -a 
> /dev/VG_XenStorage-cfc7419f-8b4e-8c51-d619-dfdee09841a2/VHD-fd118da1-c3dd-466b-8b27-32c5db1fcce7
> can't find vhd or lib
> [root@xcp47 ~]#
>
> Unfortunately, there is no online man page available in my XCP 
> installation, and blktap2 documentation mostly covers Xen's config 
> file syntax to to use with VHD storage.
> The idea to treat the VHD as a black box is not appealing at all. Is 
> there a regular way to access VHD from Dom0? What's wrong with my 
> vhdpartx, maybe it is supposed to work in a different way?
>
> I have done my search for alternatives and the most promising 
> reference I've found was one that suggests attaching the VDI (or it's 
> snapshot) to the Dom0 via a manually created VBD, just as if it was a 
> regular VM.
> http://forums.citrix.com/thread.jspa?threadID=252142
> It's quite old, and I did not get that solution work ether: I can do 
> all the steps, but the disk never showed up within Dom0, even after I 
> "vbd-plug" it.
>
> Thank you.

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