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Created by dave. Last edited by dave, 11 years and 162 days ago. Viewed 2,098 times. #2
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NFS Performance Notes for Red Hat Enterprise Linux 3.0 AMD64

Problem: RHEL 3.0 on x86_64 nfs performance doesn't go well (or at all over weak network links (like VPNs)).

Our solution has been to make this setting in /etc/init.d/autofs:

LOCALOPTIONS="tcp"

This should force the options to be effectively tcp,v3,rsize=32768,wsize=32768,hard at mount time. In the WS_U3 release, you can modify /etc/sysconfig/autofs, but this file does not appear to be present in AS or AS_U1, meaning that you have to modify /etc/init.d/autofs directly.

Note that there appears to be a maximum limit of 800 or so simultaneous mounts.

If you get an error message like

nfs bindresvport: Address already in use

This is related to the autofs bug when aggressively mounting many nfs-over-tcp filesystems (>>https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=128966)

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