Xsan 2 Administrator Guide - Affinities and Affinity Tags

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Affinities and Affinity Tags

An affinity associates a folder with particular storage pools. When you assign an affinity
to a folder, you guarantee that files placed in the folder are stored on a storage pool
that has the corresponding affinity tag.

An affinity tag groups storage pools together based on performance and
recoverability characteristics. More than one storage pool can have the same affinity
tag. Xsan distributes the contents of a folder with a specific affinity among the storage
pools that have that affinity tag. This strategy improves performance when users
simultaneously read and write files in the same folder, because the read and write
operations are distributed among the storage pools and their component LUNs.

You use Xsan Admin to assign affinity tags to storage pools and associate folders with
those affinity tags.