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Persistence
The Persistence (the database) layer, as its name implies, is the layer where the data is persisted to disk. The layer primarily consists of a series of databases performing different functions, and having different roles.
vRealize Operations uses two data storage solutions:
- Postgres: This is a relational database that stores the configuration and state of the data
- FSDB: This is a proprietary high-performance filesystem-based repository that stores all the time series data
Understanding the Persistence layer is an important aspect of vRealize Operations, as this layer has a strong relationship with the data and service availability of the solution.
vRealize Operations has five primary database services, as follows:
Prior to 6.3, a common administrator task was to re-index the database. The 6.3 release, and later releases, contain a scheduled task to re-index the database. The script itself is available at the following location: /usr/lib/vmware-vcops/user/conf/persistence/vpostgres/vpostgres_sharded_db_index_rebuild.sh.
Sharding is the term that GemFire uses to describe the process of distributing data across multiple systems to ensure that compute, storage, and network load is evenly distributed across the cluster.