Re: [Nbd] Large (> 2TB) NBD devices?

[Peter Daum <gator_ml@...141...>]

On Fri, 26 Oct 2007, Wouter Verhelst <w@...112...>
wrote:
>On Tue, Oct 23, 2007 at 06:45:25PM +0200, Peter Daum
wrote:
>> Is it possible to use NBD on devices > 2TB?
>> I don't see anything about it in the documentation.
>> When I export a larger device, the nbd client
process
>> prints the usual Negotiation: ..size = xxx and then
>> silently exits (Large File Support is on, the
kernel
>> is compiled with CONFIG_LBD).
>
>In theory, it should be possible; the protocol works
with 64bit file
>offsets everywhere, so it is able to handle files of
up to 2^64 in
> size.
>
>In practice, I've never really tested it. When I try
to run
>nbd-tester-client against an nbd-server that exports
two files of 1.5T
>using the multifile option, that works; so it would
appear that any
>failure would be caused by something else than the
server. I don't
>think I can pinpoint it, though.

I can confirm, that the problem must be on the client
side:
Meanwhile, I installed a 64bit-system on the machine
with the big
disks (unfortunately also my only machine where I have
this option):

Now, I can access large nbd devices exported by this
machine from the
same machine via loopback, while other machines (with
32-bit-systems)
still show the same problem.

Regards,
                    Peter Daum



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