Apple Xsan 2 (Third Edition) - Manual (Page 29)

Setting Up a SAN 29
5 In the Configure Volume Affinities pane, drag LUNs from the left column to the
corresponding affinity tag in the right column.
a Drag the special metadata LUN you created (in Step 6, “Create a Metadata Array”) to
the MetadataAndJournal affinity tag.
b Drag your other LUNs to the other affinity tags.
To avoid wasting storage, all LUNs assigned to an affinity tag should be the same
size.
c If you’re left with any affinity tags that contain no LUNs, delete them.
d When you finish, click Continue.