Storage Pools

MapR-FS storage architecture consists of multiple storage pools that reside on each node in a cluster. A storage pool is made up of one or more disks grouped by MapR file system. The default number of disks in a storage pool is three. The containers that hold MapR file system data are stored in and replicated among the storage pools in the cluster.

The following image represents disks grouped together to create storage pools that reside on a node:

Write operations within a storage pool are striped across disks to improve write performance. Stripe width and depth are configurable with the disksetup script. Since MapR file system performs data replication, RAID configuration is unnecessary.