Xsan volume may not mount, fsmpm may not run after migrating from Mac OS X v10.6 to OS X Lion (Apple KB)

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Xsan may need to be enabled on OS X Lion clients that were migrated from Mac OS X v10.6 via the Migration Assistant. A migrated system may show fsmpm's status as not running, or may show the computer as unreachable or offline in Xsan Admin on another system such as the metadata controller.

Read more: https://support.apple.com/en-us/HT202273