PostgreSQL 10 High Performance - Third Edition

Bonnie++ ZCAV

Just like HD Tune, Bonnie++ has a utility, a separate binary named ZCAV, that will track transfer rate across the disk. It produces a simple text file you can save to a file:

./zcav -f/dev/sda > sda.zcav 

You will probably need to run this program as root as it accesses the whole drive. You can convert the program's output to a graph using the gnuplot software.

Unfortunately, results from ZCAV on the experimental branch using version 1.96 haven't been usable in my own tests. I find myself needing to drop back to the 1.03e version for ZCAV to work properly. Hopefully this gets sorted out before the official version 2.0 is released.

There are some examples of ZCAV results on the Bonnie++ site; here's the output showing performance ...