Phil already mentioned the part of the Graylog documentation explaining how 
to expand the disk space in the virtual machine appliances: 

You can also activate a better compression in Elasticsearch at the expense 
of CPU usage:

   - https://www.elastic.co/blog/elasticsearch-storage-the-true-story-2.0

And of course there's always the possibility to tune your index retention 
settings to simply keep less logs on the System / Indices page of the 
Graylog web interface.


On Wednesday, 21 September 2016 04:43:24 UTC+2, 8bits...@gmail.com wrote:
> I have Elasticsearch data and it's logs written to a 2nd HDD than where 
> the OS is.  This HDD, 100GB, is constantly getting maxed out with ES's logs 
> which I manually delete, but I see the indices are slowly creeping up in 
> size too.  Is there a compression option that I am missing?  Or how would I 
> move data to a 3rd HDD, bigger in size of course, without losing anything 
> collected this far?  Would it be as simple as stopping Graylog, copying the 
> folders over, define new path, and restart Graylog?

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