rpc.mountd stops functioning

[Johan van den Dorpe <johan.vandendorpe@framestore-cfc.com>]

Hello,

For a long time we've been experiencing problems with rpc.mountd 
stopping functioning.

I'm finding it hard to pinpoint the precise circumstances where we 
encounter a problem, but here is what we have observed:

- A mount request, or a showmount -e, to the server will hang

- The server will print a log message authenticating the mount request

- The server doesn't print log messages that it has authenticated 
unmount requests.

- Killing rpc.mountd and then restarting it fixes the problem (I've not 
tried a HUP)

- There is a correlation between the number of mounts being handled 
(i.e. the number of entries in rmtab) and the frequency of the problem.

- The problem only occurs on servers that are mounted by a significant 
number of hosts (500-700).

- The more exports on the server, the more frequently the problem occurs.

- It should be noted that clients are mounting subdirectories of a 
single exported filesystem, so number of rmtab entries > number of xtab 
entries.

- Clearing the rmtab and restarting nfs (service nfs restart) seems to 
provide the longest time between failures.

-- 
Johan van den Dorpe


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