Apple Xsan 1.0 - Manual (Page 35)

Chapter 2 Setting Up a Storage Area Network 35
Step 10: Add Storage Pools to the Volumes
1 Select a volume in the list and click the New Storage Pool button (next to the list).
2 In the storage pool dialog, provide the following information.
Storage Pool Name: Type a name for the storage pool. If the OK button is disabled
after you type a name, the name is reserved. For a list of reserved names, see “You Can’t
Add a Storage Pool” on page 76.
Use For: Choose the type of data to store in the storage pool. Journal data is used by
the controller to ensure the integrity of files in the volume. Metadata is file system
information used by the controller. Journal data and metadata are always stored at
least on the first storage pool in a volume. If this is not the first storage pool in the
volume, you can choose “User data only.” To allow only files saved in a folder that has
an affinity for this storage pool, enable “Only data with affinity.”
Stripe Breadth: Unless you have calculated a different value for performance tuning,
leave this set to the default (64 blocks). Otherwise, change to the amount of data
written, in turn, to each LUN in the storage pool. For optimum performance with
Xserve RAID systems, the stripe breadth multiplied by the block allocation size (which
you set for the volume) should equal 1 MB (1048576 bytes). For more information, see
“Choosing Stripe Breadth for a Storage Pool” on page 50.
Permissions: To prevent users from modifying the contents of the storage pool,
change to Read Only.
Multipath Method: If you have two Fibre Channel connections between each client
computer and Xserve RAID system, choose how Xsan uses the connections. Choose
Rotate to have Xsan alternate between the connections for maximum throughput.
Choose Static to have Xsan assign each LUN in the storage pool alternately to one of
the connections when the volume is mounted.
3 Click OK to return to the list.
4 Repeat for each storage pool you need.
Step 11: Add LUNs (RAID Arrays) to Storage Pools
The final step in preparing storage for the SAN is assigning LUNs to the storage pools in
your SAN volumes:
1 Select a storage pool on the Storage pane and click Available LUNs.
A drawer opens with a list of all the LUNs you initialized on page 33.
2 Drag LUNs from the drawer to the storage pool.
If a new LUN is not the same size as LUNs already in the storage pool, the usable size is
shown next to the LUN in the list.
3 Click Save.
LL0192.book Page 35 Thursday, July 29, 2004 5:20 PM