diff --git a/src/metrics.js b/src/metrics.js
index 309afea45..7efb206f3 100644
--- a/src/metrics.js
+++ b/src/metrics.js
@@ -15,9 +15,9 @@ const apps = require('./apps.js'),
     fs = require('node:fs'),
     net = require('node:net'),
     os = require('node:os'),
-    path = require('node:path'),
     { Readable } = require('node:stream'),
     safe = require('safetydance'),
+    shell = require('./shell.js')('metrics'),
     superagent = require('@cloudron/superagent'),
     _ = require('./underscore.js');
 
@@ -99,23 +99,29 @@ async function readCpuMetrics() {
     return { userMsecs, sysMsecs }; // these values are the times spent since system start
 }
 
-async function readDiskMetrics() {
+let gRootDiskName = null;
+async function getRootDiskName() {
+    if (gRootDiskName) return gRootDiskName;
+
     const mounts = await fs.promises.readFile('/proc/mounts', { encoding: 'utf8' });
-    const rootLine = mounts.split('\n').find(line => line.split(' ')[1] === '/');
-    if (!rootLine) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Root mount not found');
+    const rootfsLine = mounts.split('\n').find(line => line.split(' ')[1] === '/');
+    if (!rootfsLine) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Root mount not found');
+    const devicePath = rootfsLine.split(' ')[0]; // eg. /dev/foo . This can be a partition or a disk path
 
-    const devicePath = rootLine.split(' ')[0]; // e.g., "/dev/sda1"
-    const base = path.basename(devicePath); // remove /dev/
-    const match = base.match(/^(.*?)(p?[0-9]+)?$/);
-    const blockDevice = match ? match[1] : base;
-    if (!blockDevice) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Could not find root block device name');
+    // -n is no headings , -d is no holder devices or slaves , -o is output format . PKNAME is parent kernel name
+    const output = await shell.spawn('lsblk', [ '-ndo', 'PKNAME', devicePath ], { encoding: 'utf8' });
+    gRootDiskName = output.trim() || devicePath.replace('/dev/', '');
+    return gRootDiskName;
+}
 
+async function readDiskMetrics() {
+    const rootDiskName = await getRootDiskName();
     const diskstats = await fs.promises.readFile('/proc/diskstats', { encoding: 'utf8' });
-    const statsLine = diskstats.split('\n').find(l => l.includes(` ${blockDevice} `));
-    if (!statsLine) throw new BoxError(BoxError.EXTERNAL_ERROR, 'Could not get disk stats');
+    const statsLine = diskstats.split('\n').find(l => l.includes(` ${rootDiskName} `));
+    if (!statsLine) throw new BoxError(BoxError.EXTERNAL_ERROR, `Could not get disk stats of ${rootDiskName}`);
 
     const parts = statsLine.trim().split(/\s+/);
-    const sectorsRead = parseInt(parts[5], 10);   // field 6 . one sectiro is 512 bytes
+    const sectorsRead = parseInt(parts[5], 10);   // field 6 . one sector is 512 bytes
     const sectorsWrite = parseInt(parts[9], 10); // field 10
     const blockRead = sectorsRead * 512;
     const blockWrite = sectorsWrite * 512;