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What I am wondering is, would the network be more (or less) efficient if I moved the contents of /opt on the server to, say, /home/opt, then on the client had only one mount line then a bind mount line;
Well there would be slightly less overhead on a single connection, in terms of the outright connectivity, but when comparing the management overhead with the files themselves, there is no worthwhile saving to be made.
There is a big difference between NFSv3, which you're presumably using, and NFSv4. the old version is UDP and portmap based, whilst the newer stndards are much simpler and purely TCP based on a single connection port, and also only have one export per server as the formal model, using the fsid=0 terminology, largely similar to your thoughts about a single mount point on v3.
I am now receiving errors when trying to invoke particular tools in /opt/softwarea and /opt/softwareb
\o Error trying to exec /opt/softwarea/tools/jre1.50/bin/java (deleted).
\o Check if file exists and permissions are set correctly.
\o *Error* Failed to launch WaveScan. There is a problem with the DFII
\o installation hierarchy (Exit Code = 81).
\o For further assistance, contact Cadence Customer Support
\o with the diagnostic information available in the log file.
\o You can use AWD as your waveform viewer until the problem
\o is resolved.
\o *Info* Dumping diagnostic information ....
\o Loading schematic.cxt
\o Loading lo.cxt
\o /opt/cds/softwarea/tools/dfII/bin/checkwavescan: line 348: uudecode: command not found