HP0-J73 · Question #132
What is the purpose of LUN presentation?
The correct answer is A. To enable/disable a specific host to access a LUN. LUN presentation (also called LUN masking) is the mechanism that controls which specific hosts are permitted to see and access a given LUN on a storage array.
Question
What is the purpose of LUN presentation?
Options
- ATo enable/disable a specific host to access a LUN
- BTo allow tape devices to access data on a LUN
- CTo prevent large I/O reads from disk devices
- DTo create shared folders on Ethernet-attached storage
How the community answered
(47 responses)- A91% (43)
- B2% (1)
- C4% (2)
- D2% (1)
Why each option
LUN presentation (also called LUN masking) is the mechanism that controls which specific hosts are permitted to see and access a given LUN on a storage array.
LUN presentation works by associating host identifiers (such as WWNs in Fibre Channel or IQNs in iSCSI) with specific LUNs on the storage controller, selectively enabling or disabling visibility per host. This prevents unauthorized hosts from accessing storage volumes and is a fundamental SAN security and access-control feature.
Tape devices operate through separate backup protocols and do not access block storage LUNs via LUN presentation mechanisms.
LUN presentation has no role in throttling or restricting I/O read sizes; that is handled by QoS or storage controller policies.
Shared folders are a file-level NAS concept served over SMB or NFS and are entirely separate from block-level LUN access control on a SAN.
Concept tested: LUN masking and host-based storage access control
Source: https://docs.netapp.com/us-en/ontap/san-admin/selective-lun-map-concept.html
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