iostat vmstat

- vmstat 30
  cpu intensive ?
  memory paging ?
  r, free, si, so

- iostat -x
  avgqr-z
  await
  %util (100%?!)

Run iostat with kilobytes unit, 2 seconds interval with 3 times reports
# iostat -k 2 3

1. https://devwebcl.blogspot.com/2014/05/distinctive-recipes-2nd-ed-1212-1211.html
2. https://www.geeksforgeeks.org/iostat-command-in-linux-with-examples/
3. https://www.techrepublic.com/article/how-to-use-the-linux-iostat-command-to-check-on-your-storage-subsystem/