Mac OS X disk performance monitoring Which tools to use for detailed performance analysis of disk access?


per disk
per process
queues
latency
data volume/throughput
errors
characterisation (read Vs write, burst, etc.)


Tried iostat, iopending, could use a syste
Instruments (which is part of Xcode) and dtrace are the heavy hitting analytical tools for most disk measurement jobs. Both are free and both take a little training to use unless you find someone to set up your traces for you to match your above criteria. 

Look for errors in system.log or the console app.