Elastic Search disk/storage usage identification

Hi All

I am running Elastic Search 6.2.4 on a 150 GB virtual machine. The disk is 31% utilized which means more than 100 GB is free.

df -k .
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos-root 157260800 47396716 109864084 31% /

I keep seeing these messages on the elastic search logs files.

[2019-01-07T14:59:58,596][INFO ][o.e.c.r.a.DiskThresholdMonitor] [JUz2YCv] low disk watermark [85%] exceeded on [JUz2YCvyRxi-qrtqrO3Z0A][JUz2YCv][/var/lib/elasticsearch/nodes/0] free: 5.2gb[10.5%], replicas will not be assigned to this node

I have not done any specific cluster settings in Elastic Search.

GET /_cluster/settings
"persistent": {},
"transient": {}

Could someone help me why I am seeing this issue?

Can you share your elasticsearch.yml config file?

Also, can you share the whole output of df (i.e. without the . at the end)?

hi David
Thanks for the pointer. Once I saw the whole output of "df" I noticed that I was looking at the wrong mount. The mount that was being used by ES data folders was indeed having space issues. This is no longer an issue now. And can be closed.

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