diff --git a/dashboard/src/components/GraphItem.vue b/dashboard/src/components/GraphItem.vue
index d828ede3d..247f266ce 100644
--- a/dashboard/src/components/GraphItem.vue
+++ b/dashboard/src/components/GraphItem.vue
@@ -185,7 +185,7 @@ function onPeriodChanged() {
       min: 0,
       grace: 100*1000, // add 100kBps. otherwise, the yaxis auto-scales to data and the values appear too dramatic
       ticks: {
-        callback: (value) => `${prettyDecimalSize(value)}ps`,
+        callback: (value) => `${prettyDecimalSize(value)}/s`,
         maxTicksLimit: 6 // max tick labels to show
       },
       beginAtZero: true,
@@ -197,7 +197,7 @@ function onPeriodChanged() {
       min: 0,
       grace: 50*1000, // add 50kBps. otherwise, the yaxis auto-scales to data and the values appear too dramatic
       ticks: {
-        callback: (value) => `${prettyDecimalSize(value)}ps`,
+        callback: (value) => `${prettyDecimalSize(value)}/s`,
         maxTicksLimit: 6 // max tick labels to show
       },
       beginAtZero: true,
diff --git a/src/metrics.js b/src/metrics.js
index bfd1cca6f..aed00d8bf 100644
--- a/src/metrics.js
+++ b/src/metrics.js
@@ -114,7 +114,6 @@ async function readDiskMetrics() {
     const blockDevice = match ? match[1] : base;
     if (!blockDevice) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Could not find root block device name');
 
-
     const diskstats = await fs.promises.readFile('/proc/diskstats', { encoding: 'utf8' });
     const statsLine = diskstats.split('\n').find(l => l.includes(` ${blockDevice} `));
     if (!blockDevice) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Could not get disk stats');
@@ -359,6 +358,9 @@ async function readSystemFromGraphite(options) {
 // Network:
 //    raw stats: ip -s link show eth0
 //    testing: curl -o /dev/null https://ash-speed.hetzner.com/10GB.bin and then use nethogs eth0 (cycle with 'm')
+// Disk:
+//    writing: fio --name=rate-test --filename=tempfile --rw=write --bs=4k --ioengine=libaio --rate=20M --size=5000M --runtime=150 --direct=1. test with iotop
+//    reading: fio --name=rate-test --filename=tempfile --rw=read  --bs=4k --ioengine=libaio --rate=20M --size=5000M --runtime=150 --direct=1. test with iotop
 async function getSystem(options) {
     assert.strictEqual(typeof options, 'object');