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Cluster : Storage > Aggregates : Understanding aggregates : How you use aggregates to provide storage to your volumes
How you use aggregates to provide storage to your volumes
To support the differing security, backup, performance, and data sharing needs of your users, you group the physical data storage resources on your storage system into one or more aggregates. These aggregates provide storage to the volumes that they contain.
Each aggregate has its own RAID configuration, plex structure, and set of assigned disks or array LUNs.  You create an aggregate to hold one or more volumes—the logical file systems that share the physical storage resources, RAID configuration, and plex structure of that common containing aggregate.
Aggregates can be mirrored or unmirrored. An unmirrored aggregate has only one plex; mirrored aggregates have two plexes.
The cluster administrator can assign one or more aggregates to a Vserver, in which case you can use only those aggregates to contain volumes for that Vserver.
For information about best practices for working with aggregates, see Technical Report 3437: Storage Best Practices and Resiliency Guide.
Related Link:  
TR 3437: Storage Best Practices and Resiliency Guide

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