# "Too small maximum heap"
**URL:** https://discuss.elastic.co/t/too-small-maximum-heap/288816
**Category:** Elasticsearch
**Created:** [November 9, 2021, 7:42pm UTC](https://discuss.elastic.co/t/too-small-maximum-heap/288816 "2021-11-09T19:42:01Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Russell\_Fulton](https://discuss.elastic.co/u/Russell_Fulton)
#### Post date: [November 9, 2021, 7:42pm UTC](https://discuss.elastic.co/t/too-small-maximum-heap/288816/1 "2021-11-09T19:42:01Z")
I have installed 7.14 on a new machine running ubuntu 18.04. This machine has 48 GB of memory and is identical to another machine that I am currently running ES 7.14 on.
The Elasticsearch.yml is identical and jvm.options (apart from things like host names and IP addresses).
The machine had been part of the cluster in the past and had 6.86 installed that started fine but when I installed 7.14 it refuses to start with errors from java:
` Nov 10 07:48:10 secmonprd08.its.auckland.ac.nz systemd-entrypoint[8992]: Too small maximum heap`
jvm.options sets
```auto
-Xms20
-Xmx20
```
top shows:
```auto
48,604,004 total,
46,607,076 free,
1,202,560 used,
794,368 buff/cache
```
Any idea what the issue is or how to diagnose it?
---
### Author:  [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)
#### Post date: [November 9, 2021, 7:46pm UTC](https://discuss.elastic.co/t/too-small-maximum-heap/288816/2 "2021-11-09T19:46:21Z")
`-Xmx20` means the maximum heap size is 20 bytes, which is definitely far too small. Try `-Xmx20g` instead.
---
### Author:  [@Russell\_Fulton](https://discuss.elastic.co/u/Russell_Fulton)
#### Post date: [November 9, 2021, 7:53pm UTC](https://discuss.elastic.co/t/too-small-maximum-heap/288816/3 "2021-11-09T19:53:42Z")
ROTFL! it had to be something really simple!
Thanks!
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 7, 2021, 7:54pm UTC](https://discuss.elastic.co/t/too-small-maximum-heap/288816/4 "2021-12-07T19:54:07Z")
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