# Cluster stats - mem
**URL:** https://discuss.elastic.co/t/cluster-stats-mem/146697
**Category:** Elasticsearch
**Created:** [August 30, 2018, 11:59am UTC](https://discuss.elastic.co/t/cluster-stats-mem/146697 "2018-08-30T11:59:23Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@paulkeogh](https://discuss.elastic.co/u/paulkeogh)
#### Post date: [August 30, 2018, 11:59am UTC](https://discuss.elastic.co/t/cluster-stats-mem/146697/1 "2018-08-30T11:59:24Z")
My cluster returns a stats API response of;
```
....
"mem": {
"total": "1.2tb",
"total_in_bytes": 1350889963520,
"free": "3.4gb",
"free_in_bytes": 3708395520,
"used": "1.2tb",
"used_in_bytes": 1347181568000,
"free_percent": 0,
"used_percent": 100
}
...
```
What exactly is this measuring ? The server that hosts all nodes in the cluster only has 256G of RAM so I am wondering about the total figure of 1.2T.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 27, 2018, 11:59am UTC](https://discuss.elastic.co/t/cluster-stats-mem/146697/2 "2018-09-27T11:59:25Z")
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