Re: [Nbd] nbd-client can't connect to named export from initramfs

[Wim Muskee <wimmuskee@...17...>]

On Tue, Mar 20, 2012 at 9:58 AM, Wouter Verhelst <w@...112...> wrote:
> On Mon, Mar 19, 2012 at 05:56:13PM +0100, Wim Muskee wrote:
>> On Mon, Mar 19, 2012 at 12:06 PM, Wouter Verhelst <w@...112...> wrote:
>> > On Sat, Mar 17, 2012 at 09:45:39PM +0100, Wim Muskee wrote:
>> >> I'm experiencing an odd nbd-client problem, I can't connect to a named
>> >> export from inside an initramfs.
>> >>
>> >> On the server runs nbd-server (3.0) as a service, the
>> >> /etc/nbd-server/config is as follows:
>> >> [generic]
>> >> [ltsp]
>> >> exportname = /opt/ltsp-images/ltsp-dev-i686.img
>> >> virtstyle = none
>> >>
>> >> The client initramfs contains an nbd-client from a nbd-3.0 install. It
>> >> uses the 3.0.6 kernel (x86). The command it uses is:
>> >> nbd-client 192.168.0.1 -N ltsp /dev/nbd0
>> >>
>> >> When it tries to connect, something fails in the negotiation:
>> >> nbd: registrered device at major 43
>> >> Negotiation: ..size= 4229768MBError: Exported device is too big for
>> >
>> > That claims it's a 4TiB export. That can't be right.
>> >
>> > What's the actual size of the file you're trying to export?
>> >
>> The actual size is about 350Mb. Perhaps it miscalculates the size
>> under certain conditions.
>> But still it's weird because it can connect when using port based exports.
>
> Very weird, yes.
>
>> >> me. Get 64-bit machine :-(
>> >>
>> >> When I boot the client normally, I can do the same command, and
>> >> connect to the image without problems.
>> >
>> > That's even stranger. I'd think that if it doesn't work in initramfs, it
>> > wouldn't work in the normal system, either.
>> >
>> > Which distribution is this?
>> >
>> Gentoo, using Dracut as the initramfs builder.
>
> I don't have much experience with dracut. I know it exists and that it supports
> NBD, but that's about it.
>
> I'll try and set up a testing environment soon so I can try to reproduce
> and debug this. Will get back to you after that.
>
hi Wouter,

the problem was fixed. After all it was a problem in Dracut with the
nbd-client command which resulted in this error.
The line used was: nbd-client 192.168.0.1 '-N ltsp' /dev/nbd0
and removing the quotes fixed it.

thx for your help
> --
> The volume of a pizza of thickness a and radius z can be described by
> the following formula:
>
> pi zz a