On linux systems, running
iostat -x
gives you great data on disk performance and in particular how much of a bottleneck the disk is. How can I get similar stats on a Mac? In particular, I'm looking for
iowait = how much total CPU time the system is waiting on IO
avgqu-sz = how many I/O requests are queued up waiting for the disk to service them
await = average time it takes to service I/O requests
