Free DES-1111 sample questions

Correct answer: The ESXi host's Hardware Acceleration support status is set to 'Unknown'.

For VAAI (vSphere Storage APIs for Array Integration) primitives like XCOPY (Full Copy) to function, the ESXi host must recognize the array's capabilities. If the Hardware Acceleration support status for the datastore is 'Unknown' or 'Not Supported', ESXi will revert to its native data mover, causing the CPU overhead. This is often due to a rescan being needed or a misconfiguration in the pathing policy.

Correct answer: False

This statement is false. A primary function of the BCSD tool is to analyze the host I/O workload (specifically the write workload) to calculate the necessary network bandwidth required to support the SRDF/A replication and meet the desired RPO. While latency is a critical factor in SRDF/S, for SRDF/A, the bandwidth calculation to handle the delta sets is the key network planning output from BCSD.

Correct answer: Historical analysis of I/O patterns indicating a sustained imbalance in port utilization.

The AIOps Assistant in Unisphere for PowerMax leverages machine learning to analyze historical performance data. A recommendation to rebalance workloads across front-end ports would be triggered by detecting a pattern of sustained high utilization on some ports while others are underutilized, which can create a performance bottleneck. The assistant identifies this imbalance and suggests redistributing host paths to achieve better load balancing.

Correct answer: TimeFinder SnapVX and SRDF/S

This is the optimal combination. TimeFinder SnapVX provides highly space-efficient, pointer-based snapshots for frequent local recovery points against logical corruption. SRDF/S (Synchronous) provides zero data loss (RPO=0) remote replication for disaster recovery. Together, they form a comprehensive business continuity solution that addresses both requirements.

Correct answer: SRDF/Star

SRDF/Star is the correct topology. It allows a primary site (A) to replicate to a secondary site (B) using one SRDF mode (e.g., synchronous) while also replicating to a tertiary site (C) using another SRDF mode (e.g., asynchronous). In this configuration, Site B also replicates to Site C, providing protection against a failure at Site A. This 'star' configuration with a primary workload site and two remote sites meets the requirements perfectly. graph TD subgraph Site_A [Primary Site] A(PowerMax) end subgraph Site_B [Secondary Site - 100km] B(PowerMax) end subgraph Site_C [Tertiary Site - 2000km] C(PowerMax) end A -- "SRDF/S" --> B A -- "SRDF/A" --> C B -- "SRDF/A" --> C

Correct answer: There are one or more delta sets in transit to the R2 side.

In SRDF/A, the 'Consistent' state means that the R2 side has a consistent copy of the data, but there might still be delta sets that have been captured on the R1 side and are currently in transit over the network. The SRDF session cannot be dissolved until all captured data has been successfully transmitted and applied to the R2 side. The presence of these in-transit delta sets will cause the dissolve operation to fail.

Correct answer: Round-trip latency of less than 10ms

While bandwidth is important, the most critical and restrictive requirement for SRDF/Metro is round-trip network latency. To maintain synchronous writes and provide a single LUN image across both sites, the latency must be very low, typically under 10ms round-trip time (RTT), with under 5ms being the strong recommendation for performance. The 50km distance is within the supported range, but if the network path introduces higher latency, the implementation will fail or perform poorly.

Correct answers: Peak Host Write MB/s; Peak Host Write IOPS

For SRDF/S, every host write must be acknowledged by the remote array before being acknowledged back to the host. Therefore, the network must be able to handle the peak write workload. The two most critical metrics are the peak write throughput (MB/s) to determine bandwidth, and the peak write I/O operations per second (IOPS) to understand the number of round trips and the impact of latency. Read operations are not replicated and are therefore irrelevant for sizing the replication link.

Correct answer: The administrator initiates the snapshot from the vSphere client, which offloads the command to the PowerMax via VASA to create a TimeFinder SnapVX snapshot.

With a vVols implementation, storage operations are VM-centric and managed through the vSphere client. When a snapshot is requested in vCenter, the VASA (vSphere APIs for Storage Awareness) provider communicates the request to the PowerMax array, which then uses its native TimeFinder SnapVX technology to create a highly efficient, offloaded snapshot of the necessary vVols. The storage administrator does not need to interact directly with the array.

Correct answer: The primary application is an encrypted OLTP database.

Deduplication works by identifying and eliminating redundant blocks of data. Encrypted data has high entropy, meaning blocks appear unique even if the underlying data is identical. This prevents the deduplication engine from finding matches, resulting in a ratio near 1:1. Compression, which works on patterns within individual blocks, may still yield some results (though often limited on encrypted data), but deduplication will be almost completely ineffective.