Richard P Mackerras wrote: >Hi, > >We had some bully type workloads emerge when we moved a lot of block >storage from old XIV to new all flash 3PAR. I wonder if your IMAP issue >might have emerged just because suddenly there was the opportunity with all >flash. QOS is good on 9.x ONTAP. If anyone says it’s not then they last >looked on 8.x. So I suggest you QOS the IMAP workload. > > Nobody should be using UDP with NFS unless they have a very specific set >of circumstances. TCP was a real step forward. Well, I can't argue with this, considering I did the first working implementation of NFS over TCP. It was actually Mike Karels that suggested I try doing so, There's a paper in a very old Usenix Conference Proceedings, but it is so old that it isn't on the Usenix web page (around 1988 in Denver, if I recall). I don't even have a copy myself, although I was the author.
Now, having said that, I must note that the Network Lock Manager (NLM) and Network Status Monitor (NSM) were not NFS. They were separate stateful protocols (poorly designed imho) that Sun never published. NFS as Sun designed it (NFSv2 and NFSv3) were "stateless server" protocols, so that they could work reliably without server crash recovery. However, the NLM was inherently stateful, since it was dealing with file locks. So, you can't really lump the NLM with NFS (and you should avoid use of the NLM over any transport imho). NFSv4 tackled the difficult problem of having a "stateful server" and crash recovery, which resulted in a much more complex protocol (compare the size of RFC-1813 vs RFC-5661 to get some idea of this). rick Cheers Richard _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org" _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
