Hi, I have checked the archive, but I can't find any reference to a simple IO 'tester' app to benchmark disk IO. I am fairly sure it would be easy to write a little tool to do this. Has anyone done that? I would like to be able to say things like ioRateTool --test-file /IDEDiskMount/testFile.scratch ioRateTool --test-file /SCSIDiskMount/testFile.scratch ioRateTool --test-file /NFSDiskMount/testFile.scratch ioRateTool --test-file /ramfsDiskMount/testFile.scratch ioRateTool --test-file /dev/null/testFile.scratch Although I guess that last one could only measure 'disk' write speed and not read speed. I want to see if my current NFS settings can be optimized, and I would like a clean (and hopefully robust) way to check what effect changing the options have. Thanks for any pointers, Dan. Ahhh... I just found the collective NFS rant... We use NFS as our principal 'communication' channel, that is to say it is our group sand box. We put all our downloaded databases / scripts / data / homes on one big nfs server. This allows us to work on the same data easily, share files / results etc. Most of our 'day to day' computing is over this data. How many Hail Mary's should I say?