Xsan: Update to StorNext SNFS v4.2.1 controller to avoid data loss issue (Apple KB)

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Xsan clients (running OS X Lion or Lion Server v10.7.2 or earlier) that access filesystems hosted by controllers which use StorNext SNFS version 4.2.0 may experience data loss when renaming files on StorNext-hosted volumes.

Read more: https://support.apple.com/en-us/HT200114