How to collect performance data from hds array?

You can collect data with GUI or CLI interface SNM2 (Storage navigator modular 2).

What is default output directory?

Default output dir is ./output

When you run script it will generate directory structure like this

$ find ./output/
./output/
./output/93050318
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19/drive.html
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19/main.html
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19/dp.html
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19/cpu.html
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19/port.html
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19/index.html
./output/93050318/2014.11.10_16.27.16-2014.11.11_16.27.19/cache.html
./output/93050318/index.html
./output/index.html

You can set any directory, but do not forget copy flot library from ./output dir to your dir (or change path to flot library in template files ./template/*.html )