Changes to QoS for VoIP is affecting NFS

Discussion in 'Cisco' started by Richard Lefebvre, Jan 14, 2005.

  1. Hi,

    Our campus is starting to switch over to a setup of VoIP for the basic
    phone services using cisco hardware. The thing is since the QoS was
    changed to accommodate the VoIP, the NFS of our department went down.
    After some sys-admin gymnastics I was able to reestablish some
    functionality of NFS (basically forcing NFS to go through TCP instead
    of UDP). But NFS over TCP is so slow...

    Only the SGI (IRIX) clients are affected by the problems, plain Linux
    box were OK. After some more testing, I was able to make NFS/UDP work
    for file transfer by adding rsize=4096,wsize=4096 to the mount command
    but as soon as I would try to do an ls of a directory with a lot of
    files, NFS would choke again. So reducing the read/write size helped,
    but not completely. Just this week, I learned that another department
    has similar problems with Macintoshes. Any one has similar problems
    or suggestion I can give the network managers.

    Richard Lefebvre, Jan 14, 2005
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