Free D-PVM-OE-01 sample questions

Correct answer: Diamond

The Diamond SLO is specifically designed for the most demanding mission-critical applications that require the absolute lowest latency. It targets response times of less than 500 microseconds and is the only SLO that leverages SCM (Storage Class Memory) as a persistent storage tier for data, making it the optimal choice for this high-performance OLTP database. Platinum targets <1ms, Gold targets <2ms, and Silver targets <5ms, none of which strictly guarantee the required sub-500 microsecond performance.

Correct answers: Increase the SRDF link bandwidth between the R1 and R2 arrays.; Enable SRDF Compression on the link.

A high number of transmit cycles and cache utilization indicate that the R1 array cannot send data to the R2 array fast enough, causing a backlog. The two most direct solutions are to increase the available bandwidth on the SRDF link or to reduce the amount of data that needs to be transmitted by enabling compression. Both actions will help clear the backlog and bring the RPO back into compliance. Converting to SRDF/S would impact host latency and is a different DR strategy, not a fix for an RPO issue in SRDF/A. Splitting the SRDF pair would stop replication altogether.

Correct answer: The NDM session is running in a background, low-priority CPU cycle.

NDM is designed to be non-disruptive, which means it operates as a background task using spare system resources to avoid impacting front-end host I/O. On a heavily utilized source array, particularly one with a high-transaction database, there may be very few spare cycles available for the migration task, leading to slow progress. This is an intentional design feature to protect production workloads. While other factors could play a role, the contention for system resources on a busy source array is the most probable cause when network bandwidth is not the bottleneck.

Correct answer: True

This statement is true. Both SnapVX snapshots and clones are pointer-based and space-efficient upon creation. They do not consume any additional capacity from the Storage Resource Pool (SRP) at the moment of creation, other than a small amount of metadata. Both only begin to consume space as new writes are directed to the source volume (for snapshots) or the clone volume (for clones), triggering copy-on-write or redirect-on-write operations.

Correct answer: symauthd

The `symauthd` (Symmetrix Authorization Daemon) is responsible for handling authentication and authorization for Solutions Enabler clients. It allows for centralized management of user access controls, which is a key requirement in the scenario. The `storapid` daemon handles communication with the array, while `storsrvd` is the main service daemon, but `symauthd` specifically deals with enforcing security policies.

Correct answer: There are a high number of read cache misses for the Storage Group.

PowerMax arrays service writes very quickly by acknowledging them once they are written to persistent cache, resulting in low write latency. Reads, however, can have higher latency if the requested data is not in cache (a read miss) and must be retrieved from the back-end flash/SCM drives. The pattern of low write latency and high read latency for a specific SG strongly suggests that its workload is experiencing a low read cache hit ratio, forcing the array to frequently go to the back-end for data. SRP capacity, port saturation, or snapshots would typically affect both reads and writes.

Correct answer: The VASA Provider and the Protocol Endpoint (PE)

The vStorage APIs for Storage Awareness (VASA) Provider is the critical software component that allows the PowerMax array to communicate its capabilities (like SLOs and replication) to vCenter. vCenter then uses this information for Storage Policy-Based Management (SPBM). The Protocol Endpoint (PE) is the data path access point on the array for ESXi hosts to connect to vVols. Both are fundamental to a functioning vVols environment that uses SPBM.

Correct answer: It immediately starts the background copy of data from the source to the target.

The `-precopy` option instructs the migration session to begin the bulk data copy from the source device to the target device in the background immediately after the session is created. This allows the majority of the data to be synchronized before the final cutover, minimizing the application downtime required for the final sync and cutover.

Correct answer: Failover the A->C leg, bring applications online at Site C, then establish a new C->B replication leg.

In an SRDF/Star scenario where the primary site (A) is lost, the direct path to recovery at the remote site (C) is to perform a failover operation on the asynchronous A->C leg. This makes the devices at Site C read/write. Once applications are online at Site C, the original B->C leg (which was receiving data from B) must be dropped, and a new replication leg from C to B must be established to protect the new production workload running at Site C. This makes C the new primary, and B its new synchronous or asynchronous target.

Correct answer: Modify the existing Masking View and replace the incorrect Port Group with the correct one.

Masking Views in Unisphere for PowerMax are mutable. An administrator can modify an existing view to add or remove components. The most efficient and direct method is to simply edit the view, remove the incorrect Port Group, and add the correct Port Group. Deleting and recreating the view is unnecessary work. Modifying the SG or IG is incorrect as those components were correct in the scenario.