Diskplorer - disk latency/bandwidth grapher

Diskplorer is a small wrapper around fio that can be used to graph the relationship between concurrency (I/O depth) and throughput/IOPS.

Requirements

Diskplorer requires:

1. Python 3
2. python3-matplotlib
3. fio (version 2.0.10 or later)

On Fedora 23, the dependencies can be installed via:

dnf install python3-matplotlib fio

Running diskplorer

Running diskplorer.py will create a 100GB test file in the current directory, and produce a graph named disk-concurrency-response.svg in the same place. The test file is not deleted after a run.

Diskplorer also support the following command-line options:

-h, --help            show this help message and exit
-d MOUNTPOINT, --mountpoint=MOUNTPOINT
                      Test disk mounted at MOUNTPOINT
-b DEV, --device=DEV  Test block device DEV (overrides --mountpoint)
-s SIZE, --filesize=SIZE
                      Set SIZE as file size for test
-m N, --max-concurrency=N
                      Test maximum concurrency level N
-o FILE, --output=FILE
                      Write output graph to FILE

Example results

Here are results on a fairly good NVMe SSD. At its peak, the drive is delivering 1.8GB/sec.