Apple Xsan 1.4 - Manual (Page 92)

92 Chapter 3 Managing SAN Storage
Choosing the Types of Files Stored on a Storage Pool
You can limit the files that are stored on a particular storage pool to volume journal
data and metadata, user data, user data with an affinity for that storage pool, or a
combination of these.
Journal data and metadata are always stored on the first storage pool in a volume.
To choose the data types for a storage pool:
1 In Xsan Admin, select the SAN the storage pool belongs to, click Setup, and click
Storage.
2 Double-click the storage pool in the list.
3 Next to “Use for,” choose the data types to store on the storage pool.
4 Click OK, and then click Save.
Setting Storage Pool Stripe Breadth
The default stripe breadth value (256 file system blocks) is adequate for storage pools
in most SAN volumes. However, you can adjust this value along with the file system
block allocation size to tune SAN performance for special applications. For help
choosing a stripe breadth, see “Choosing Stripe Breadth for a Storage Pool,” below.
Warning: When you change the data type of a storage pool, all data on the storage
pool and the volume to which it belongs is lost.
Warning: When you change a storage pool’s stripe breadth, all data on the storage
pool and the volume to which it belongs is lost.