On Mon, Apr 25, 2016 at 7:47 PM, Stefan Lissmats <stefan@xxxxxxxxxx> wrote:
> Hello again!
>
> I understand that it's not recommended running osd and rbd-nbd on the same host and i actually moved my rbd-nbd to a completely clean host (same kernel and OS though), but with same result.
>
> I hope someone can resolve this and you seem to indicate it is some kind of known error but i didn't really understand the github commit that you linked.
Yes, it is a bug. rbd-nbd code expects writes to have rval (return
code) equal to the size of the write. I'm pretty sure that's wrong,
because rval for writes should be 0 or a negative error.
I think what happens is your writes complete successfully, but rbd-nbd
then throws an -EIO to the kernel because 0 != write size. I could be
wrong, so let's wait for Mykola to chime in - he added that check to
fix discards.
Thanks,
Ilya
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