On Sat, 31 Aug 2019 at 22:28, John Harris <joh...@splentity.com> wrote:
> On Saturday, August 31, 2019 1:09:58 AM MST Tom H wrote: > > On Thu, Aug 29, 2019 at 5:40 AM John Harris <joh...@splentity.com> > wrote: > > > > > > > > > > > NFS over UDP is faster than NFS over TCP. > > > Until the ethernet switches get busy -- then it is common to find that UDP packets are dropped. > > > > When using nfsv3, yes. But nfsv4 is tcp-only. > > nfsv4 is also slower than nfsv3, and isn't as well supported on different > systems. > These days, "different" usually means Windows. The merits of different nfs versions and UDP vs TCP depend on the workloads, network usage and topologies, etc. nfsv3 locking uses separate processes. A years ago my work had lots of MacOS systems with nfsv3. If a client crashed (or lost power) lock files were sprinkled thru the server filesystem, causing problems for backups and other clients until the server was taken offline and the locks removed. Our workloads involved random transfers of 10-100GB data sets (numerical model output or remote sensing data sets) combined with scheduled overnight replication of a local data centre to a backup site. As a result we often had network congestion problems so UDP was not an option. My experience with nfsv4 on linux in this environment was relatively free of problems. -- George N. White III
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