Re: [Nbd] Question about the expected behaviour of nbd-server for async ops
- To: Alex Bligh <alex@...872...>
- Cc: nbd-general@lists.sourceforge.net, Wouter Verhelst <w@...112...>
- Subject: Re: [Nbd] Question about the expected behaviour of nbd-server for async ops
- From: Paul Clements <paul.clements@...856...>
- Date: Tue, 31 May 2011 08:07:42 -0400
- Message-id: <BANLkTi==L8_gcALzr1AmbN-xLtRcxYN+ZA@...18...>
- In-reply-to: <462585F1D4B5526B79791BDA@...873...>
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On Mon, May 30, 2011 at 11:14 AM, Alex Bligh <alex@...872...> wrote:
>
>
> --On 30 May 2011 14:13:04 +0200 Goswin von Brederlow <goswin-v-b@...186...>
> 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
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