NFS locking problem, solaris 10, nfsd stops serving

Hi all,
First time poster, short time viewer.
To set the scene...
I have an x86 SAM-QFS installation under management currently. The SAM-QFS infrastructure consists of 2x meta data controllers and 2x file service heads, that currently share out NFS (they are NFS servers).
These systems are not clustered, nor do they have any form of "high availability". They can be failed between, but this is very much a manual process.
The file service heads are running mounted SAM-FS filesystems. These file systems are shared out in the form of /etc/dfs/dfstab style exports to NFS clients (some 250 Mac OS X Tiger/Leopard clients) that use NFS for their home directories et al.
So, here is where things become sad.
For the past month, we've been fighting with our nfsd. Unfortunately for us, at (apparently) completely random moments, our nfsd will simply stop responding to requests, cease to serve out nfs to clients and then silently stop processing any locking/transfer/mapping requests. An svcadm restart nfs/server does nothing, as the process simply 'hangs' in a state of reattempting to stop/start the nfsd. We find that the only way to get nfs to respond is to completely reboot the host. At this point only, will nfs reshare with the "shareall" command based upon our entries in /etc/dfs/dfstab
We have been though a lengthy support case with Sun. We are getting NO closer to understanding the problem, but we are providing Sun with every possible detail we can. We've even gotten to the point of writing crash dumps from the machine out to disk using commands such as 'uadmin 5 1' and then sending our entire vmcore outputs to Sun.
We are stabbing in the dark suggesting it might be file locking related, but we cannot/do not have enough visibility on the inside of the nfds to be able to tell what is happening. We've tried increasing the number of nfs_server allowed daemons in /etc/default/nfs, as well as made the maximum NFS version to serve out as v3, but it hasn't helped us here at all.
If anyone has any experience with what could possibly cause NFS to do this, in what (we thought) was a fairly common, NFS environment, it would be appreciate. Our infrastructure is fairly grounded until we have a resolution to an issue Sun simply can't seem to pinpoint.
Thank you.
z.

I have the same problem on a samfs server. I have never come accross a shittier system then a samfs system. I feel for people who have to support them. SAMFS takes an easy concept and makes it an overwhelming problem.

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    "deptech.lan" with ip adress of the DNS
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    >
    > thankDo this in this way,
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    8. Then it will appear ' name service"
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    10 . enter " server ip "
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    N.B: for going next stages / contiues you have to use " F2" key..
    then it will configured..
    Let me know if its ok or for any problem..
    Thanks
    Partha

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