D-PWF-DS-23 Exam Dumps : Dell PowerFlex Design 2023 Exam

To configure Storage Data Targets (SDTs) for I/O operations with hosts using the NVMe over Fabric protocol, the following requirements are necessary:

• The Storage port must be configured with the host role: The storage port, which is part of the SDT, needs to be configured to communicate with the host systems. This involves setting the port to operate in the host role, which allows it to handle input/output operations with the hosts1.
• The NVMe Qualified Name (NQN) of the hosts is known: The NQN is a unique identifier used in NVMe over Fabrics to identify both NVMe targets and hosts. Knowing the NQN of the hosts is essential for proper configuration and communication between the SDTs and the hosts1.
• A minimum of two NVMe targets must be assigned to a Protection Domain: For redundancy and to ensure continuous availability, it is recommended to have at least two NVMe targets assigned to a Protection Domain. This allows for failover capabilities and load balancing across multiple paths1.

These requirements are based on the best practices for setting up NVMe over Fabric protocols as outlined in the PowerFlex documentation and resources. Proper configuration of the storage ports, knowledge of the NQN, and assignment of NVMe targets to a Protection Domain are crucial steps in ensuring successful I/O operations with NVMe over Fabrics1.

In a PowerFlex appliance environment, Fault Sets are used to group Storage Data Servers (SDSs) that are managed together as a single fault unit. When Fault Sets are employed, the distributed mesh-mirror copies of data are never placed within the same fault set1. This means that each Fault Set must have enough SDSs to ensure that data can be mirrored across different Fault Sets for redundancy.

Given that there are only five Storage Only nodes available in the described environment, and considering that each node runs an SDS, it may not be possible to create Fault Sets using all available servers if the number of Fault Sets or the distribution of SDSs across those Fault Sets does not allow for proper mirroring of data. The architecture requires a certain number of SDSs to be available to form a Fault Set that can be used for data mirroring and redundancy1.

The other options, such as requiring more than one Management node (Option A) or not having enough Compute Only nodes (Option C), are not directly related to the creation of Fault Sets. The Management node’s primary role is to manage the cluster, not to participate in Fault Sets, and Compute Only nodes do not contribute storage resources to Fault Sets.

Therefore, the correct answer is B. There are not enough Storage Only nodes, as this would prevent the architect from creating Fault Sets that meet the redundancy requirements of the PowerFlex appliance environment.

Before adding a Fault Set in PowerFlex, two critical aspects must be in place: a Protection Domain and Storage Pools.

• Protection Domain: This is a logical grouping of storage resources that share the same protection policy and fault tolerance settings. It defines the boundaries of failure domains and is essential for ensuring data availability and resilience1.
• Storage Pools: These are collections of storage media across multiple nodes within a Protection Domain. Storage Pools provide the physical storage where data is actually placed. They are necessary for the creation of volumes and for the distribution of data across the system1.

Fault Sets are used to group nodes that share a common risk of failure, such as being in the same rack or power circuit. When creating Fault Sets, it’s important that they are defined within an existing Protection Domain and utilize the storage resources allocated within Storage Pools. This ensures that data remains available and protected even if a Fault Set fails, as the system can rebuild the data using the remaining Fault Sets and Storage Pools1.

The information provided here is based on the best practices and design principles outlined in Dell PowerFlex documentation, which details the requirements for setting up and configuring various components of the PowerFlex system, including Fault Sets1.