Disk Alarm Triggered even when there is enough disk space

[Samir Gandhi]

We are experiencing an issue where disk alarm is triggered by RabbitMQ blocking publishers from sending any more messages.

When we look at the log file, it says "Insufficient Disk Space" ( we have left the default configuration to 50 MB DISK_FREE_LIMIT).

However when we look at actual free space on Disk , it is around 15 GB,

The issue goes away once we re-start Rabbit MQ Services.

The free space on hard-drive (c drive), where it is writing logs as well mnesia db files are located is around 15 GB, and machine has 32 GB

of RAM.

We are not sure, what is causing the issue and it is bringing the system down once every day where we have to re-start services.

We are thinking of moving logs and db to D drive, where there is around 100 GB of available space.

Not sure if it will fix the issue, as the disk alarm got triggered even though there was enough space on C drive.

Please let me know if I am missing something, any help would be greatly appreciated

I have to check exact version number, but it is past 3.2

Thanks,

Samir Gandhi

[Michael Klishin]

You need to inspect the logs if something might have caused the disk space monitor to exit.

There were multiple releases and issues fixed since 3.2.x:

http://www.rabbitmq.com/changelog.html

One specific that comes to mind:

https://github.com/rabbitmq/rabbitmq-server/issues/362

The default limit is so low because on some OS'es default partitions are < 1 GB, which means a newly installed

RabbitMQ node can sometimes block publishers immediately with the old default of 1 GB.

See http://www.rabbitmq.com/production-checklist.html for guidelines on limits that makes more sense for production.

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MK

Staff Software Engineer, Pivotal/RabbitMQ