# Disk Usage Tuning
**URL:** https://discuss.elastic.co/t/disk-usage-tuning/118122
**Category:** Elasticsearch
**Created:** [February 1, 2018, 11:31pm UTC](https://discuss.elastic.co/t/disk-usage-tuning/118122 "2018-02-01T23:31:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@fpr](https://discuss.elastic.co/u/fpr)
#### Post date: [February 1, 2018, 11:31pm UTC](https://discuss.elastic.co/t/disk-usage-tuning/118122/1 "2018-02-01T23:31:10Z")
Hi,
I want to save disk space for storing syslog data. As I am not interested in full text search I defined the mappings for string fields like this:
"SourceLocation" : {
"type" : "keyword",
},
For testing I indexed the same data with the standard mappings which maps strings as both text and keywords:
"SourceLocation" : {
"type" : "text",
"norms": false,
"index\_options": "docs",
"fields" : {
"keyword" : {
"type" : "keyword",
}
}
},
I noticed no difference in needed disk space.
Should not the first variant with only keyword mapping need much less space?
I am using ES 5.6
---
### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [February 3, 2018, 11:23am UTC](https://discuss.elastic.co/t/disk-usage-tuning/118122/2 "2018-02-03T11:23:30Z")
How much data did you index (I would recommend at least a few hundred MB)? How many shards did you use (I would recommend using a single primary shard)? Did you run forcemerge down to 1 segment in order to make a fair comparison?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 3, 2018, 11:23am UTC](https://discuss.elastic.co/t/disk-usage-tuning/118122/3 "2018-03-03T11:23:51Z")
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