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EMC Dell XtremIO Design Achievement Sample Questions (Q31-Q36):
NEW QUESTION # 31
An XtremlO administrator wants to understand the I/O transfer process. What are the parts of a typical I/O transfer?
Answer: A
Explanation:
A typical I/O transfer involves several components that work together to ensure data is correctly sent and received. These components include:
* Protocol: This defines the rules for how data is transmitted between devices. It ensures that the sender and receiver are using a common language and standards.
* Header: The header contains metadata about the data being transferred, such as source and destination addresses, error checking codes, and sequencing information.
* Data: This is the actual payload or information that is being transferred.
* Handshaking: This part of the process involves the exchange of control messages before the actual data transfer begins. It establishes the parameters of the communication channel and confirms that both sender and receiver are ready for the transfer.
These components are essential for the successful completion of an I/O transfer, ensuring that data is accurately and reliably transmitted from one point to another.
References:
* The Dell XtremIO Design documents provide a detailed understanding of the product features, functionality, use cases, and configurations, which includes the I/O transfer process as a fundamental aspect of storage array operations1.
* Additional resources on I/O transfer processes can be found in the support documentation for the XtremIO Family on Dell's official website2.
NEW QUESTION # 32
Which X-Brick cluster topology is exclusive to XtremIO X2?
Answer: D
Explanation:
XtremIO X2 supports configurations starting from a single X-Brick and scaling up to multiple X-Bricks.
However, the X2 system can support up to 8 X-Bricks in a cluster, not just 4, so option D is more correct.
NEW QUESTION # 33
Which I/O elevator setting should be selected for use with XtremIO?
Answer: A
Explanation:
The I/O elevator setting for use with XtremIO should be selected based on the operating system and the workload characteristics. For systems running Red Hat Enterprise Linux (RHEL) and connecting to XtremIO X2 storage arrays, the recommended I/O elevator settings are either noop or deadline.The noop scheduler is often recommended for SSDs and all-flash arrays like XtremIO because it is a simple FIFO queue that does not do any merging or reordering of I/O requests, which is unnecessary for SSDs due to their low latency and high performance1.
References:
* Dell EMC Ready Solutions for Oracle with XtremIO X2 document1.
* Support documentation for XtremIO Family on Dell's official website2.
NEW QUESTION # 34
What is the fingerprint bit size created by the algorithm used by XtremIO?
Answer: A
Explanation:
The Dell XtremIO X2 Storage Array uses an inline data deduplication process which involves fingerprinting data blocks. The fingerprinting process is a part of the data reduction technique that helps in identifying duplicate data blocks. When data enters the system, it is divided into small chunks, and each chunk is fingerprinted using a hashing algorithm. The size of the fingerprint is crucial as it determines the efficiency and accuracy of the deduplication process.
The specific bit size of the fingerprint created by the algorithm used by XtremIO is256 bits.This information is derived from the detailed descriptions of the system's architecture and operation as provided in the Dell EMC XtremIO X2 Storage Array documentation1. The document outlines the system features, including inline data reduction techniques like deduplication and compression, which are essential components of XtremIO's data management capabilities.
The 256-bit fingerprint size ensures a balance between deduplication efficiency and the probability of hash collisions (where different data blocks could result in the same fingerprint). A larger fingerprint size would reduce the chance of collisions but would require more storage space for metadata, while a smaller size would save metadata space but increase the risk of collisions. Therefore, the 256-bit size is a strategic choice for the XtremIO system's deduplication process.
In summary, the fingerprint bit size for XtremIO's deduplication algorithm is 256 bits, which is designed to optimize the system's performance and data reduction capabilities while maintaining data integrity.
NEW QUESTION # 35
When creating XtremlO volumes for a host, which operating systems will benefit by changing the default logical block size for applications consisting of 4 KB I/Os?
Answer: A
Explanation:
When creating XtremIO volumes for a host, operating systems like Microsoft Windows and RHEL (Red Hat Enterprise Linux) will benefit from changing the default logical block size to better match applications that consist of 4 KB I/Os. This is because these operating systems are commonly used with applications that have a
4 KB I/O size, and aligning the logical block size with the application I/O size can improve performance by reducing the need for read-modify-write cycles.
For instance, in Windows environments, the NTFS file system often uses a default cluster size of 4 KB, which aligns well with a 4 KB logical block size.Similarly, for RHEL, the Ext4 file system can be configured with a
4 KB block size, which is a common setting for many Linux-based applications12.
References:
* Discussions on Dell Technologies community forums indicate that changing the logical block size can prevent issues with unaligned I/O and is part of a larger configuration strategy for optimizing storage performance3.
* The Reference Architecture Guide for Dell EMC XtremIO documents mention using a block size of 64 KB for database data and log file drives after the installation of the operating system in the VMs, for Windows and RHEL operating systems respectively12. This suggests that the block size is an important consideration for performance tuning in these environments.
NEW QUESTION # 36
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