Apple Xsan 1.1 - Manual (Page 18)

18 Chapter 1 Overview of Xsan
In the example illustrated on page 16, two storage pools are combined to create a
single shared volume.
You create volumes and mount them on client computers using the Xsan Admin
application.
The following screen image shows how LUNs, storage pools, and volumes appear as
you organize them in the Xsan Admin application. This example shows a SAN named
“Editing SAN” with a single shared volume named “SanVol.” Storage for the volume is
provided by two storage pools, “Meta” and “Data,” the first based on a single LUN and
the second on two. Each of the LUNs is a 3-disk RAID 5 array on an Xserve RAID using
115 GB drive modules.
Folders With Affinities
To control which storage pool is used to store specific files (for example, to provide
different levels of service for different users or applications), you can associate a folder
on an Xsan volume with one of the storage pools that make up the volume.
If, for example, you set up storage pools with different balances of performance and
data redundancy, users can choose between faster and safer storage by putting files in
the appropriate folder.
Volume
Storage pool
LUN
SAN