I am testing out the new logstash 6.3.0 and all it does is error out and crash saying i don't have enough disk space if my queue.max_bytes: is set to anything higher than about 9400mb.
My data dir has 190GB free and I have tested this on different machines just to make sure i wasn't having some kind of hardware problem
bash-4.2$ cat config/logstash.yml | grep data
bash-4.2$ df -h /usr/share/logstash/data
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_root-lv_opt 190G 237M 190G 1% /usr/share/logstash/data
bash-4.2$ cat config/logstash.yml | grep queue