[rabbitmq-discuss] RabbitMQ writes non stop to disk

Raphael Simon raphael at rightscale.com
Tue Oct 25 17:23:48 BST 2011

All the messages are consumed pretty much immediately. I cannot believe
that our throughput would cause a sustained 6000 writes/s. It doesn't on
all the other brokers (sorry forgot to mention this only happens on one


On Tue, Oct 25, 2011 at 4:26 AM, Simon MacMullen <simon at rabbitmq.com> wrote:

> On 25/10/11 02:07, Raphael Simon wrote:
>> Hello all,
>> We are seeing an issue on a production broker where the RabbitMQ process
>> writes non stop to files in mnesia/<node>/msg_store_**persistent. It
>> keeps
>> creating new files and the problem seems to be getting worse. Listing
>> the files in that directory shows that it's creating a new 16 MB file
>> every 2 to 4 minutes [1].
>> The throughput of persistent messages in this broker is orders of
>> magnitude less (maybe 20 msg/sec at the most, each being in the 10s of
>> KB) .
> Umm, if you average 10 msg/s and 30kB each (picking figures out of the
> air), that's 300kB/s. 16MB takes less than a minute to write at that speed.
> What were you expecting to see?
> Cheers, Simon
> --
> Simon MacMullen
> RabbitMQ, VMware
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