Optimal Flexible Architecture

Description of the Optimal Flexible Architecture (OFA) for MongoDB.

Inspired by Oracle standards, dbi services has developed an equivalent Optimal Flexible Architecture (OFA) for MongoDB. Its purpose is to provide a logical, efficient, and maintainable directory structure.

All MongoDB instances follow the same installation and management conventions, enabling easier automation.

Mount Points and Paths

The recommended mount points for an OFA-compliant MongoDB system are listed below:

Mount Point	Purpose
/u01	Administration files, database binaries, DMK installation and configuration files
/u02	Data files
/u03	Journal files
/u04	Log files
/u90	Backups and dumps

Important paths on your system :

Path	Purpose
/u01/app/mongodb/product/x.y.z	MongoDB binaries. X.Y.Z is the main MongoDB version (8.0.16, for instance)
/u01/app/mongodb/local/dmk	DMK installation path
/u01/app/mongodb/etc	Location of the mongodb.lst file, listing the MongoDB instances on the server
/u01/app/mongodb/artifacts	Stage path to keep tar.gz binaries files
/u01/app/mongodb/admin/<instance_name>	Configuration files for MongoDB instances
/u02/mongodb/data/<instance_name>	MongoDB data files
/u03/mongodb/journal/<instance_name>	MongoDB journal files
/u04/mongodb/log/<instance_name>	MongoDB log files
/u90/mongodb/backup/<instance_name>	MongoDB backups and dumps

Variables associated with OFA

These variables are located in the $DMK_HOME/etc/dmk.conf.default file.

For any of these variable, you can override the default value by using set_local_dmk_config.py, for instance:

mongodb@vm00:/home/mongodb/ [mdb01] set_local_dmk_config.py INSTANCE MONGO_JOURNAL "\${MONGO_DATA_ROOT}/\${MONGO_INSTANCE}/journal"

Variable	Path	Purpose
$MONGO_BASE	/u01/app/mongodb	Binary files, instance configuration files.
$MONGO_DATA_ROOT	/u02/mongodb/data/	MongoDB data files.
$MONGO_JOURNAL_ROOT	/u03/mongodb/journal/	MongoDB journal files. If you don't want to separate MongoDB journal and data files, set MONGO_JOURNAL_ROOT to the same value as MONGO_DATA_ROOT with set_local_dmk_config.py
$MONGO_LOG_ROOT	/u04/mongodb/log/	MongoDB instances log files. Default changed in release 2.3.0 from /u02/mongodblog to /u04/mongodb/log, to separate data and log files. Use set_local_dmk_config.py to override this variable.
$MONGO_BACKUP_ROOT	/u90/mongodb/backup	MongoDB backups location.

These directory conventions help standardize deployment and maintenance across environments.