312-40 practice question 25 of 25

Elaine Grey has been working as a senior cloud security engineer in an IT company that develops software and applications related to the financial…

Elaine Grey has been working as a senior cloud security engineer in an IT company that develops software and applications related to the financial sector. Her organization would like to extend its storage capacity and automate disaster recovery workflows using a VMware private cloud. Which of the following storage options can be used by Elaine in the VMware virtualization environment to connect a VM directly to a LUN and access it from SAN?

Answer options

A: File Storage

B: Object Storage

C: Raw Storage Correct answer

D: Ephemeral Storage

Correct Answer:

C. Raw Storage

Explanation

The requirement is to connect a Virtual Machine (VM) directly to a Logical Unit Number (LUN) on a Storage Area Network (SAN). This is achieved using raw storage, which presents a block-level storage device to the VM. In the VMware vSphere environment, this feature is called Raw Device Mapping (RDM). An RDM allows a VM to directly access and use a LUN, bypassing the VMware file system (VMFS), which is necessary for certain applications like clustering or when using specific SAN management tools within the guest OS.

Why Incorrect

A. File Storage (like NFS) operates at the file system level, not the block level, and does not provide direct LUN access to a VM.
B. Object Storage (like S3) is an architecture for unstructured data accessed via APIs and is not suitable for providing block-level LUNs to a VM.
D. Ephemeral Storage is temporary, non-persistent block storage that is tied to the lifecycle of the VM instance itself, not a persistent LUN on a SAN.

References

1. VMware, Inc. (2022). vSphere Storage (ESXi 8.0, vCenter Server 8.0 Documentation). Retrieved from https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-storage/GUID-499664E3-2646-4598-A49B-33A233566B4C.html. (The section "Raw Device Mapping" explicitly states, "VMware Raw Device Mapping (RDM) is a mapping file in a separate VMFS volume that acts as a proxy for a raw physical storage device").

2. VMware, Inc. (2022). Understanding Raw Device Mapping. vSphere Storage Documentation. Retrieved from https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-9E6336E5-DA11-499F-B65A-1A32475D595A.html. (This document details the benefits and use cases for RDM, confirming it provides direct access to a LUN on the SAN).

3. Wahl, M. (2014). Networking for VMware Administrators. VMware Press. (Chapter 10, "Storage," discusses different storage types, including block storage with SANs and the role of RDM for direct LUN access).

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