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Thanks very much.Yeah, I learn that "NFS over UDP/IP is much more prone to data corruption than over TCP/IP" from Eisler's nfs blog at "http://nfsworld.blogspot.kr/2006_03_01_archive.html"
But, there is still a issue that glusterfs supports NLMv1 over UDP already, which seems opposite that NLM over UDP hasn't implemented. The following shows some details:
#rpcinfo -p | grep 100021
100021 4 tcp 38468 nlockmgr
100021 1 udp 745 nlockmgr
100021 1 tcp 746 nlockmgr
I was a bit confused.
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2016-01-07 14:28 GMT+08:00 Kaushal M <kshlmster@xxxxxxxxx>:
The GlusterFS NFS service only supports the NFSv3 protocol over TCP.On Thu, Jan 7, 2016 at 11:00 AM, Sponge Tsui <jingjinglake@xxxxxxxxx> wrote:
> hi, I'm sorry to ask for help if it is a common question. I noticed
> that in glusterfs NLMv4 is only available over TCP,but not available
> over UDP as the show of "rpcinfo -p" when using glusterfs to export
> volumes through NFS protocol. The result is as follow:
>
> program vers proto port service
> 100000 4 tcp 111 portmapper
> 100000 3 tcp 111 portmapper
> 100000 2 tcp 111 portmapper
> 100000 4 udp 111 portmapper
> 100000 3 udp 111 portmapper
> 100000 2 udp 111 portmapper
> 100005 3 tcp 38465 mountd
> 100005 1 tcp 38466 mountd
> 100003 3 tcp 2049 nfs
> 100021 4 tcp 38468 nlockmgr
> 100227 3 tcp 2049
> 100021 1 udp 868 nlockmgr
> 100021 1 tcp 869 nlockmgr
> 100024 1 udp 34507 status
> 100024 1 tcp 40511 status
>
> I want to find out that why NLMv4 wasn't supported over UDP while
> NLMv4 has been supported over TCP already. Whether or not NLMv4 over
> UDP would be took into account.
>
> Please excuse me if I've used bad terminology. Maybe it's because of
> some other issues that i didn't realize. To be honest, I'm a newcomer
> for glusterfs less than a mouth.
>
> Thanks for your attention. I'm looking forward to your reply, and any
> answers will be appreciated !
So the NLM service was also implemented only over TCP.
As for the reason why only TCP support was implemented for NFS, it was
probably because NFSv3 over TCP provided support for most clients,
with the least amount of implementation effort.
>
>
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