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Dell EMC DEE-1111 Expert - PowerMax and VMAX All Flash Solutions Exam Practice Test
Question 1
Which metrics are recommended to start analyzing the overall efficiency of the array due to cache?
Answer : D
The metrics that are recommended to start analyzing the overall efficiency of the array due to cache are array-level % Hit and % Cache WP. The array-level % Hit metric shows the percentage of read requests that are satisfied from the cache memory, without accessing the physical disks. A high % Hit value indicates that the cache is effective in reducing the read latency and improving the performance. The % Cache WP metric shows the percentage of cache memory that is occupied by write pending data, which is data that has been written to the cache but not yet destaged to the physical disks. A high % Cache WP value indicates that the cache is under pressure and may not have enough space to accommodate new write requests, which can lead to performance degradation. By monitoring these two metrics, a storage administrator can evaluate the overall efficiency of the array due to cache and identify any potential issues or bottlenecks.
System efficiency overview | Dell PowerMax: Data Reduction | Dell Technologies Info Hub
Metrics (PowerMax & VMAX) - VMware Docs
Replication cache | Dell EMC PowerMax and VMAX All Flash: TimeFinder SnapVX Local Replication
Question 2
An SRDF/Metro device pair was in an ActiveActive state. A link failure between arrays occurs. The application continues running on the R1 side, and the link failure is addressed.
What is the current state of the Metro device pair?
Answer : B
An SRDF/Metro device pair was in an ActiveActive state, meaning that both the R1 and R2 devices were read/write accessible to the host or hosts. A link failure between arrays occurs, causing the device pair to become Not Ready (NR) on the SRDF link. SRDF/Metro responds by making the non-biased or R2 paired device inaccessible (not ready) to the host or host cluster, while keeping the biased or R1 paired device accessible (ready). This ensures that there is no data inconsistency or split-brain scenario between the two sites. The device pair enters an Active Bias state, which indicates that only one side of the pair is active and has a bias attribute set. The bias attribute determines which side of the pair remains accessible in case of a link failure. By default, the bias is set to the R1 side of the pair, but it can be changed using the symrdf set bias command. The application continues running on the R1 side, and the link failure is addressed. Once the link is restored, the device pair resumes the ActiveActive state and both devices become accessible again.
VMware vSphere Metro Storage Cluster (vMSC) with Dell PowerMax and Dell EMC VMAX SRDF/Metro
Question 3
An administrator is configuring SYMACL on a PowerMax array.
What are possible ways to get a unique ID for a host system?
Answer : D
The SYMACL unique ID for a host system can be obtained in two ways: derived from a host-based passphrase or randomly generated by the Solutions Enabler lockbox file. The host-based passphrase is a string that the user can specify to generate a unique ID for the host. The passphrase can be entered interactively using the symacl -unique -passphrase command, or stored in a file and passed as an argument using the symacl -unique -passphrase -file command. The Solutions Enabler lockbox file is a secure file that stores encryption keys and other sensitive information. The lockbox file can also generate a random unique ID for the host using the symacl -unique command. The lockbox file must be created and initialized before using this method.
symacl -unique : Unable to obtain unique ID for host - Dell
Question 4
During a Non-Disruptive Migration (NDM), what is the result of issuing the ReadyTgt SYMCLI command to the migrating Storage Group?
Question 5
Refer to the exhibit.
PowerMax A has a current utilization of 10%, and PowerMax B has a current utilization of 70%.
What will the response times be for systems A and B if utilization increases by 10%?
Question 6
A DG group is part of a snapshot schedule which runs each day at 9 am then linked to a set of targets for a full copy after termination. Additional volumes were added which increased the link to full copy time.
What course of action will prevent the issue?
Answer : B
The-precopyoption in therelinkcommand can be used when you want to start copying data to the target devices immediately after the link operation. This can be useful in situations where additional volumes have been added, increasing the link to full copy time. By using-precopy, you ensure that the data starts copying immediately, preventing potential issues.
Question 7
vWitness and Array Witness options are deployed in the same operating environment simultaneously.
Which option does SRDF/Metro favor in this situation?
Answer : B
When vWitness and Array Witness options are deployed in the same operating environment simultaneously, SRDF/Metro favors the Witness option over the Array Witness option. This is because the Witness option provides a higher level of protection against split-brain scenarios and data loss than the Array Witness option. The Witness option uses a third-party server to monitor the health and connectivity of both SRDF/Metro arrays and to arbitrate in case of a failure. The Array Witness option uses a third array to store configuration information and to arbitrate in case of a failure. However, the Array Witness option does not monitor the health and connectivity of both SRDF/Metro arrays, and it requires manual intervention to resume SRDF/Metro replication after a failure.
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