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Re: [Qemu-devel] export root node for write through NBD
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From: |
Max Reitz |
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Subject: |
Re: [Qemu-devel] export root node for write through NBD |
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Date: |
Thu, 30 Nov 2017 15:21:47 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 |
On 2017-11-30 08:47, Vladimir Sementsov-Ogievskiy wrote:
> Hi all.
>
> We need the following option: start vm in stopped mode (-S) and write
> it's disk before start through NBD.
> It should be absolutely safe, but unfortunately it is disallowed by root
> role of the disk.
> Is there any workaround or if not, what is a true way to implement this
> possibility?
>
> ----
> error message:
> unable to execute QEMU command 'nbd-server-add': Conflicts with use
> by drive0 as 'root', which does not allow 'write' on #block100
>
> --
One thing that comes to mind is adding the guest device only after you
are done with NBD.
The other of course is to set share-rw=on for the device.
Max
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