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

[Sponge Tsui]

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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 at gmail.com>:

> 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.
>
> >
> >
> > _______________________________________________
> > Gluster-devel mailing list
> > Gluster-devel at gluster.org
> > http://www.gluster.org/mailman/listinfo/gluster-devel
>
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