[Gluster-devel] NLMv4 isn't available over UDP

[Soumya Koduri]

On 01/07/2016 11:58 AM, Kaushal M wrote:
> On Thu, Jan 7, 2016 at 11:00 AM, Sponge Tsui <jingjinglake at gmail.com> 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 !
>
> The GlusterFS NFS service only supports the NFSv3 protocol over TCP.
> 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.
>
In addition, if you really need to use NLM4 over UDP, you could try 
NFS-Ganesha [1] which has got support for both the transport protocols.

Thanks,
Soumya

[1] 
http://gluster.readthedocs.org/en/latest/Administrator%20Guide/NFS-Ganesha%20GlusterFS%20Intergration/

>>
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