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Low disk space error on Confluence DC

Mariano
December 14, 2025

Any old school DataCentre admins here? We're less and less everyday!

Company is still hosting Confluence on DC. I have set the following Catalina env system property as per https://confluence.atlassian.com/conf720/recognized-system-properties-1168862368.html:

CATALINA_OPTS="-Ddiagnostics.os.min.free.memory.megabytes=1024 ${CATALINA_OPTS}"

 

Also tried with 512MB just to move the threshold a lot. But still atlassian-confluence.log throws:

ERROR ; OS ; OS-1002 ; Low free disk space ; not-detected ; ; ; {\"directory\":\"/var/atlassian/application-data/confluence9.5\",\"freeInMegabytes\":1259,\"totalInMegabytes\":28662,\"minimumInMegabytes\":8192}
Component 'Operating System' alerted 'Low free disk space' (details: {\"directory\":\"/var/atlassian/application-data/confluence9.5\",\"freeInMegabytes\":1259,\"totalInMegabytes\":28662,\"minimumInMegabytes\":8192}, trigger: {\"pluginKey\": \"not-detected\"})

When I start Confluence it seems to accept these system property because I see:

Using CATALINA_OPTS: -Ddiagnostics.os.min.free.memory.megabytes=1024 -Dapplinks.allow.all.hosts=true -Datlassian.plugins.startup.options='' -Dorg.apache.tomcat.websocket.DEFAULT_BUFFER_SIZE=32768 -Dconfluence.context.path= -Dsynchrony.enable.xhr.fallback=true 

 

What am I doing wrong? Thanks in advance!

2 answers

2 votes
Vronik
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December 14, 2025
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Tolga Unvermis
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December 30, 2025

Hi mate,

The parameter you’re using below triggers an alert when the operating system runs low on memory:

CATALINA_OPTS="-Ddiagnostics.os.min.free.memory.megabytes=1024 ${CATALINA_OPTS}"

However, the error you’re seeing in the logs indicates that there is not enough free disk space on the filesystem where the application is running
(/var/atlassian/application-data/confluence9.5).

In this case, you should either increase the size of this filesystem or clean up unnecessary log files and similar data to free up some space.

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