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

[Wouter V. <w...@ut...>]

On Tue, May 31, 2011 at 08:07:42AM -0400, Paul Clements wrote:
> 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

Has this always been the case? If so, there appears to be something
wrong where it does not limit requests to that size.

-- 
The volume of a pizza of thickness a and radius z can be described by
the following formula:

pi zz a