CompTIA CASP+ Practice Test

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What is the MOST likely explanation for seeing extra LUNs appearing on a UNIX server?

Incorrect user permissions
Wrong HBA allocation
Corrupted file systems
Network misconfiguration

The correct answer is: Wrong HBA allocation

The presence of extra Logical Unit Numbers (LUNs) on a UNIX server is most likely due to wrong Host Bus Adapter (HBA) allocation. LUNs are used in storage area networks (SANs) to identify specific storage volumes. If the HBA is incorrectly configured or allocated, the server may inadvertently detect additional LUNs that it should not have access to. This can occur, for example, if the HBA settings allow access to storage devices that are intended for different servers or if there is a misconfiguration in the zoning or masking settings on the storage array. When the HBA is assigned to multiple paths or connected to multiple storage targets that are not properly segmented, it can lead to the server seeing LUNs that belong to other systems. This is particularly relevant in environments with shared storage where devices are managed by complex configurations between hosts and storage elements. Therefore, ensuring proper HBA allocation is crucial to maintaining the correct visibility of storage resources and avoiding the detection of extraneous LUNs that may disrupt operations or cause security concerns. The other options—such as incorrect user permissions, corrupted file systems, or network misconfiguration—do not directly address the underlying issue of HBA allocation related to LUN visibility.