1) Ensure that your client mounts are not specifying any resize or wsize. Check to see what the resize's and wsizes mount as. (cat /proc/mounts) 2) Ensure the clients are accessing the expiated nodes and are balanced. 3) Use the following iozone command "iozone -cewa -+R 1 -r 128k -s 12g -t 16" - Run the test multiple times increasing the "-r" parameter up to 128K - Also ensure that you keep -t high, as this represents the number of threads - You have to use the "-r" flag as it designates the block size - Using the -a flag you run through a series of block sizes, and all of the tests. If you want to specify a certain test then you have to use the -i flag with the test number. If using this flag you always have to have a -i0 4) Finally ensure that the stat is stored on the appropriate nodes, IE: if you have multiple node types ensure the data is going to the correct disks on the correct nodes.
Is there a fairly simple NFS performance test methodology that can be used against an Isilon cluster?
Is there a fairly simple NFS performance test methodology that can be used 
against an Isilon cluster?