Re: [Nbd] Question about the expected behaviour of nbd-server for async ops

[Paul C. <pau...@us...>]

On Mon, May 30, 2011 at 11:14 AM, Alex Bligh <al...@al...> wrote:
>
>
> --On 30 May 2011 14:13:04 +0200 Goswin von Brederlow <gos...@we...>
> wrote:
>
>>> I don't think that not supporting extremely large requests is going to
>>> be a problem in practice, providing we return a proper error code.
>>
>> Maybe there should be an option field for this so client and server can
>> agree on a reasonable size. The client MUST then split larger requests
>> into smaller chunks.
>
> Note you will need to fix the kernel module (I think) if you want to limit
> the maximum size of a request. I am not aware of any current limit
> on the size of a request (other than 2^32 bytes).

nbd limits requests to 127KB:

/sys/block/nbd0/queue/max_hw_sectors_kb:127

--
Paul