Re: nbd request too big

From: Steven Whitehouse (steve@gw.chygwyn.com)
Date: Mon Jan 07 2002 - 10:38:29 EST


Hi,

I presume you are using Pavel's server from his web page ? You need to increase
the buffer size that the server uses. This happens as a result of the change
a little while ago of nbd to use the elevator to merge requests at the nbd
client end. If memory serves the maximum size of request is sizeof(header) +
128 * block_size, so you need to alter the server to use that size.

You'll find the buffer size in the main loop of the mainloop() function
char buf[20480]; needs increasing (to (131072 + 28) for 1k blocks for example)
and also you'll need to increase the value here (to 131072 in this example):

                if (len > 10240)
                        err("Request too big!");

Then it should work fine.

Steve.

>
> hi,
>
> i would like to setup a nbd but when I try to mke2fs
> the device on the client side, the connection hangs
> and /log/messages contains a entry for mthe server
> telling that the request was too big.
> Any idea what caused it.
>
> Thanks you
>
> Luc robalo Marques
>
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