# Unable to Calculate Disk IOPS for watcher **URL:** \ **Category:** Elasticsearch\ **Tags:** elastic-stack-monitoring\ **Created:** [April 24, 2018, 7:48am UTC](https://discuss.elastic.co/t/unable-to-calculate-disk-iops-for-watcher/129248 "2018-04-24T07:48:36Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Himanshu\_Rajput](https://avatars.discourse-cdn.com/v4/letter/h/f05b48/32.png) [@Himanshu\_Rajput](https://discuss.elastic.co/u/Himanshu_Rajput)\ **Post date:** [April 24, 2018, 7:48am UTC](https://discuss.elastic.co/t/unable-to-calculate-disk-iops-for-watcher/129248/1 "2018-04-24T07:48:37Z")
Hi, I want to implement a watch over marvel data for disk IOPS. All the fields under node\_stats.fs.data are in long which contains bytes. I want to calculate disk IOPS from these fields such as this ![Screenshot%20from%202018-04-24%2013-15-49](https://us1.discourse-cdn.com/elastic/original/3X/5/e/5ed194c9256175fde228f702064ee3b9854d844e.png) Is there any formula for this ? ---
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [April 27, 2018, 2:40pm UTC](https://discuss.elastic.co/t/unable-to-calculate-disk-iops-for-watcher/129248/2 "2018-04-27T14:40:00Z")
hey, can you explain what you mean with `calculate` in this context? This graph is just displaying the results of a query without calculating anything. --Alex ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 25, 2018, 2:40pm UTC](https://discuss.elastic.co/t/unable-to-calculate-disk-iops-for-watcher/129248/3 "2018-05-25T14:40:04Z")
Closed on May 25, 2018, 2:40pm UTC This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.