On Sun, 2019-09-01 at 09:04 -0300, George N. White III wrote: > On Sat, 31 Aug 2019 at 22:28, John Harris <johnmh@xxxxxxxxxxxxx> 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 <johnmh@xxxxxxxxxxxxx> > > 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. Or to sum up: for some use cases, working is better than fast. poc _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
