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Systems & Data Center · Intermediate

LUN Masking

An array-side access control that makes a LUN visible only to specified host initiators.

Definition

LUN masking uses initiator WWPNs or IQNs to restrict LUN visibility and complements Fibre Channel zoning in the switches. Both are used together for defense in depth.

Example

LUN 12 is masked so that only the two SQL cluster nodes' WWPNs can see it.

Exam tip

Zoning is done on the fabric switch; LUN masking is done on the storage array.

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