Xsan 2, Promise VTrak RAID: Configuring for use in a video editing environment (Apple KB)

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You can choose to deploy Xsan 2.0 or later with a single Promise VTrak RAID Controller with the intention of later expanding your storage to include VTrak Expansion Chassis and/or additional RAID controllers.

Read more: https://support.apple.com/en-us/HT200221