Asynchronous Domino endpoints capacity planning

Asynchronous Domino endpoints may impose additional storage requirements on MongoDB and RabbitMQ depending on the number of API invocations and other factors.

Here are the default volume sizes for MongoDB and RabbitMQ in a new Domino deployment:

MongoDB storage volume size: 100 GiB
RabbitMQ storage volume size: 25 GiB

The default configuration can support asynchronous Domino endpoints based on the following parameters:

Parameter	Value
Number of asynchronous Domino endpoints	100
Number of API requests per endpoint per day	5,000
MongoDB document size	10 KiB
MongoDB document retention	2 days
RabbitMQ request message size	10 KiB
RabbitMQ response message size	10 KiB
RabbitMQ request input queue retention	2 days
RabbitMQ response output queue retention	2 days

Parameter

Value

Number of asynchronous Domino endpoints

100

Number of API requests per endpoint per day

5,000

MongoDB document size

10 KiB

MongoDB document retention

2 days

RabbitMQ request message size

10 KiB

RabbitMQ response message size

10 KiB

RabbitMQ request input queue retention

2 days

RabbitMQ response output queue retention

2 days

The sections below show how to calculate MongoDB and RabbitMQ storage requirements for asynchronous Domino endpoints using the above parameters.

MongoDB storage requirements

Number of documents per endpoint per day

Number of API requests per endpoint per day
Additional MongoDB storage

Number of asynchronous Domino endpoints x Number of documents per endpoint per day x MongoDB document size x MongoDB document retention

Example:

100 endpoints x 5,000 documents per endpoint per day x 10 KiB x 2 days =~ 10 GiB

RabbitMQ storage requirements

Number of API responses per endpoint per day

Number of API requests per endpoint per day
RabbitMQ request input queue storage

Number of asynchronous Domino endpoints x Number of API requests per endpoint per day x RabbitMQ request message size x RabbitMQ request input queue retention
RabbitMQ response output queue storage

Number of asynchronous Domino endpoints x Number of API responses per endpoint per day x RabbitMQ response message size x RabbitMQ response output queue retention
Additional RabbitMQ storage

RabbitMQ request input queue storage + RabbitMQ response output queue storage

Example:

(100 endpoints x 5,000 requests per endpoint per day x 10 KiB x 2 days) + (100 endpoints x 5,000 responses per endpoint per day x 10 KiB x 2 days) =~ 20 GiB

Minimum available storage

To prevent asynchronous Domino endpoints from filling the disks, Domino monitors MongoDB and RabbitMQ disk storage metrics and stops accepting new asynchronous Domino endpoint requests when the available disk storage falls below the following configurable thresholds:

Configuration Records Key Default Value

Configuration Records Key	Default Value
`com.cerebro.domino.modelApis.async.mongoDb.minimumAvailableBytes`	500000000
`com.cerebro.domino.modelApis.async.rabbitmq.availableAsyncLimitBytes`	1000000000

com.cerebro.domino.modelApis.async.mongoDb.minimumAvailableBytes

500000000

com.cerebro.domino.modelApis.async.rabbitmq.availableAsyncLimitBytes

1000000000