Apple Xsan 2 - Manual (Page 36)

You use Xsan Admin to assign affinity tags to storage pools and associate folders with
those affinity tags.
Volumes
Storage pools are combined to create the volumes that users see. From the user’s
perspective, the SAN volume looks and behaves like a large local disk, except that:
The size of the volume can grow as you add underlying arrays or storage pools Â
Multiple users on the SAN can access files on the volume at the same time Â
In the illustration on page 34, five storage pools are combined to create a single
shared volume. You use Xsan Admin to create volumes and mount them on client
computers.
The following screen shot shows how LUNs, storage pools, and volumes look as
you organize them in Xsan Admin. This example shows a SAN with a single shared
volume named “SanVol.” Storage for the volume is provided by two storage pools,
“MetadataAndJournal” and “Data1,” the first based on a single LUN and the other on
two LUNs.
Volume
Storage pool
LUN
Folders with affinities
To control which storage pools are used to store specific files (for example, to
provide different levels of service for different users or apps), you can associate a
folder on an Xsan volume with an affinity tag that’s assigned to storage pools
that make up the volume.
36 Chapter 2 Overview of Xsan