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EMC D-XTR-OE-A-24 認定試験の出題範囲：

トピック	出題範囲
トピック 1	XtremIO and X2 Initial Configuration: System administrators and storage implementation specialists will be tested on their ability to perform initial setup of XtremIO systems. This includes the deployment of the XtremIO Management Server (XMS), along with an understanding of its support options and associated safety measures. The exam also covers the installation of Easy-CLI and XtremApp, procedures for cluster setup and validation, as well as the configuration of ESRS and ESRS VE.
トピック 2	XtremIO Online Cluster Expansion: Storage capacity planners and system upgrade specialists will be assessed on their knowledge of expanding XtremIO clusters while systems remain operational. This section covers the identification of necessary resources, preparation steps and prerequisites, and the detailed procedures for scaling clusters from single X-Brick configurations to dual and multi X-Brick setups.
トピック 3	XtremIO and X2 Installation: IT infrastructure specialists and data center technicians will be evaluated on their proficiency in deploying XtremIO and X2 systems. This encompasses understanding the necessary resources for installation, strategies for rack mounting components in both single and distributed cluster setups, and intricate cabling procedures for diverse configurations. The section also tests knowledge of power distribution and the process of assigning IP addresses to Storage Controllers.
トピック 4	XtremIO and X2 Hardware Fundamentals: System engineers and storage architects will find this section essential as it explores the architectural aspects of XtremIO and X2 systems. The exam assesses knowledge of InfiniBand switch options, battery backup solutions including SuperCap technology, and Disk Array Enclosure capacities. Candidates should also be well-versed in XtremIO X2 configuration options and the intricacies of port management.

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EMC Dell XtremIO Operate Achievement 認定 D-XTR-OE-A-24 試験問題 (Q51-Q56):

質問 # 51
A company requires synchronous replication from an XtremlO X1 cluster to a third-party array. Which replication solution will allow the company to perform this operation?

A. RecoverPoint only
B. Native XtremIO Replication
C. RecoverPoint for VMs
D. VPLEX with RecoverPoint

正解：D

解説：
For synchronous replication from an XtremIO X1 cluster to a third-party array, the solution that enables this operation isVPLEX with RecoverPoint. Here's why:
* VPLEX: Dell EMC VPLEX is a virtualization and data mobility solution that allows for continuous availability and data mobility across arrays within a data center and over distance.It is often used in conjunction with RecoverPoint to provide synchronous replication1.
* RecoverPoint: Dell EMC RecoverPoint offers continuous data protection with multiple replication options, including synchronous and asynchronous replication.It is designed to work with various storage arrays, including third-party arrays, providing flexibility in replication strategies1.
* Combination of VPLEX and RecoverPoint: When combined, VPLEX and RecoverPoint offer a comprehensive solution that supports synchronous replication, ensuring zero data loss (RPO=0) and enabling consistency across sites.This combination is particularly useful when integrating XtremIO with third-party arrays1.
* Native XtremIO Replication: While XtremIO does offer native replication capabilities, these are typically asynchronous and are designed to work within the XtremIO ecosystem.For synchronous replication, especially to a third-party array, the native replication may not be sufficient1.
* RecoverPoint for VMs: This variant of RecoverPoint is specifically designed for virtual environments and may not be the best fit for array-based synchronous replication requirements1.
Therefore, the correct answer isVPLEX with RecoverPoint(OD), as it provides the necessary infrastructure and capabilities for synchronous replication from an XtremIO X1 cluster to a third-party array, ensuring data consistency and zero data loss during the replication process1.

質問 # 52
You are connecting a VMware cluster to an XtremlO array. The host will be connected to the array using QLogic Fibre Channel HBAs. Based on best practices, what is the recommended value for the Execution Throttle?

A. 0
B. 1
C. 2
D. 3

正解：D

解説：
When configuring QLogic Fibre Channel HBAs in a VMware environment connected to a Dell XtremIO array, the recommended value for the Execution Throttle is 4096. This recommendation is based on best practices to ensure optimal performance and stability in storage environments. Execution Throttle controls the maximum number of concurrent commands that the HBA will issue to a single target, and setting it correctly helps in balancing the load and avoiding congestion on the storage network.
References:
* Dell EMC's official documentation on configuring QLogic HBAs recommends setting the Execution Throttle to 4096 to optimize performance and reliability.
* Industry best practices suggest similar values to prevent overloading the storage ports and ensure smooth operation.

質問 # 53
A new XtremlO X2-S single X-Brick cluster has been installed into a systems administrator's environment.
The administrator needs assistance with configuring a group of
volumes with the largest capacity possible.
What is the largest size supported for each volume?

A. 2 PB
B. 64 TB
C. 1 PB
D. 64 PB

正解：B

解説：
The XtremIO X2-S storage array is designed to support a significant amount of capacity per volume.Based on the information available, the largest size supported for each volume in a single X-Brick cluster is 64 TB1.
Here's a detailed explanation:
* XtremIO X2-S Capacity: The XtremIO X2-S array allows for scaling up with additional SSDs to increase capacity.A single X-Brick can support a considerable number of SSDs, which contributes to the total volume size it can support1.
* Volume Size: The volume size refers to the amount of data storage space that can be allocated for use by applications and services.In the case of XtremIO X2-S, the maximum volume size is designed to accommodate large-scale storage needs1.
* Configuration: When configuring volumes on the XtremIO X2-S, administrators can specify the desired size up to the maximum supported limit.This ensures that the storage can be tailored to the specific requirements of the environment1.
* Largest Supported Size: The option of 64 TB (OB) aligns with the high-capacity design of the XtremIO X2-S array, making it the correct answer for the largest volume size supported per volume on a single X-Brick cluster1.

質問 # 54
Which performance metric is a measure of the time taken to complete an operation?

A. Throughput
B. IOPS
C. Latency
D. Bandwidth

正解：C

解説：
Latency is the performance metric that measures the time taken to complete an operation. It is often described as the delay between a user's action and the response from the system to that action.In the context of storage systems like XtremIO, latency refers to the time it takes from when a read or write request is issued to when it is completed1.
Here's a breakdown of the options provided:
* A.Bandwidth: Bandwidth measures the amount of data that can be transferred over a network or processed by a system in a given amount of time.It is not a direct measure of time taken to complete an operation2.
* B.Latency: Latency is the correct answer as it specifically measures the time delay in completing an operation.It is a critical metric in storage and networking environments, where lower latency is generally indicative of faster system performance1.
* C.IOPS (Input/Output Operations Per Second): IOPS is a performance metric that measures the number of read and write operations that can be performed in one second.While it is related to system performance, it does not measure the time taken to complete a single operation2.
* D.Throughput: Throughput refers to the rate at which data is processed or transferred.It is similar to bandwidth and measures performance over time but does not specifically measure the time taken to complete an individual operation2.

質問 # 55

Which operation is represented in the exhibit?

A. Write-back Cache
B. Read Cache Miss
C. Write-through Cache
D. Read Cache Hit

正解：B

解説：
If the requested data is not found in cache, it is called a cache miss and the data must be read from the storage.
The back end accesses the appropriate storage device and retrieves the requested data. Data is then placed in cache and finally sent to the compute system through the front end. Cache misses increase the I/O response time.

質問 # 56
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