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NEW QUESTION # 15
Which KPIs should be reviewed when analyzing BE performance using the PowerMax array?
- A. %Busy and Balance
- B. Reqs/sec and IOPS
- C. IOPS and Utilization
- D. Balance and Reqs/sec
Answer: A
Explanation:
he %Busy and Balance KPIs are the most important indicators of the BE performance on a PowerMax array. The %Busy metric shows the percentage of time that a BE director is busy processing I/O requests. A high %Busy value may indicate that the BE director is overloaded and cannot keep up with the demand. The Balance metric shows the difference in %Busy between the two BE directors in a pair. A high Balance value may indicate that the workload is not evenly distributed across the pair, which can lead to performance degradation. By monitoring these two KPIs, a storage administrator can identify and troubleshoot any potential issues with the BE performance.
Reference:
PowerMax Performance Troubleshooting with Unisphere - Run a real time trace at the system level
NEW QUESTION # 16
A PowerMax storage group is no longer SL compliant. No changes to application I/O profile have occurred.
Which factor is most likely responsible for the SL compliance impact?
- A. Noisy Neighbor issue
- B. Host queue depth setting was changed
- C. Performance thresholds were exceeded
- D. Queue depth full event
Answer: A
Explanation:
A noisy neighbor issue occurs when one or more applications consume more resources than expected, causing performance degradation for other applications. This can affect the SL compliance of a storage group, as the service level defines the expected response time and performance for the applications in that group. If a noisy neighbor consumes too much cache, bandwidth, or CPU cycles, it can cause the SL compliance to drop below the target level. Therefore, answer A is correct.
B, C, and D are incorrect because they are not likely to cause SL compliance impact for a storage group. Queue depth full event (B) is a host-side issue that occurs when the host queue depth is too low or the host I/O rate is too high, causing the host to stop sending I/O requests to the array. Host queue depth setting is also a host-side parameter that determines how many I/O requests can be queued by the host. Performance thresholds (D) are user-defined values that trigger alerts when certain metrics exceed or fall below the specified levels. None of these factors affect the SL compliance of a storage group on the array.
NEW QUESTION # 17
Refer to exhibit.
Refer to the exhibit.
SRDF device pairs are suspended by the administrator.
Which symrdf command was issued next?
- A. symrdf swap
- B. symrdf set bias
- C. svmrdf split
- D. svmdrfhalf swap
Answer: C
Explanation:
The symrdf split command is used to suspend SRDF/A replication and make both R1 and R2 devices read/write enabled. This is useful for testing purposes or for creating point-in-time copies of data on both sides. The symrdf establish command can be used to resume SRDF/A replication after a split operation. The exhibit shows that both R1 and R2 devices are read/write enabled and have a Split status, which indicates that a symrdf split command was issued next2
NEW QUESTION # 18
During a Non-Disruptive Migration (NDM), what is the result of issuing the ReadyTgt SYMCLI command to the migrating Storage Group?
- A. Source Masking View is removed so the original source paths are in a dead state
- B. Completes the migration by removing the migrated application resources from the source array
- C. Masking View is created on the target array using elements that are created during the create command
- D. Confirms that both the source and target arrays can support IDM operations
Answer: B
Explanation:
During a Non-Disruptive Migration (NDM), issuing the ReadyTgt SYMCLI command to the migrating Storage Group completes the migration by removing the migrated application resources from the source array2. This command is typically issued after all data has been synchronized from the source to the target array and application I/O has been switched to the target array2. Reference: NDM overview | Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide | Dell Technologies Info Hub
NEW QUESTION # 19
Match Dual Personally SRDF device to its usage SRDF role.
Answer:
Explanation:
Reference:
Dell EMC SRDF Introduction - Dell Technologies Partner Portal
Dell EMC PowerMax and VMAX All Flash: SRDF Product Guide
Dell EMC PowerMaxOS Performance Guide
NEW QUESTION # 20
A three-brick PowerMax 8000 is running PowerMaxOS 5978.444.444. The system is configured with Flash Drives RAID 5 (7+1). The customer wants to expand the capacity with SCM drives.
Which minimum configuration is supported?
- A. 1x RAID 5 (7+1) added to brick one
- B. 3x RAID 5 (7+1) added to each brick
- C. 1x RAID 5 (7+1) added to each brick
- D. 2x RAID 5 (7+1) added to brick one
Answer: C
Explanation:
When expanding the capacity of a three-brick PowerMax 8000 running PowerMaxOS 5978.444.444 configured with Flash Drives RAID 5 (7+1) with SCM drives, the minimum supported configuration is 1x RAID 5 (7+1) added to each brick. This ensures that each brick has additional capacity and maintains the balance of storage across all bricks2. Reference: Dell EMC PowerMax Family Product Guide PowerMaxOS, Dell PowerMax Family Site Planning Guide PowerMax 2000 and PowerMax 8000, POWERMAX FAMILY PowerMax 2000 and 8000 - Dell Technologies Partner Portal
NEW QUESTION # 21
SRDF/Metro is deployed in a clustered host configuration. The RDF link state is partitioned, and the R1 side has full read/write capability to the application.
What is the state of the R2 device?
- A. Has only read capability to the application
- B. Goes Not Ready to the host
- C. Bias is applied
- D. Has full read/write capability to the application
Answer: D
Explanation:
In a SRDF/Metro deployment in a clustered host configuration, when the RDF link state is partitioned and the R1 side has full read/write capability to the application, the R2 device also has full read/write capability to the application. With SRDF/Metro, both R1 and R2 devices may then appear as a single virtual device across the two SRDF paired arrays for host presentation. With both the R1 and R2 devices being accessible, the host or hosts (in the case of a cluster) can read and write to both R1 and R2 devices with SRDF/Metro ensuring that each copy remains current, consistent, and addressing any write conflicts which may occur between the paired SRDF devices23. Reference: Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices, Deploying Dell EMC SRDF/Metro Smart DR with Microsoft SQL Server for Physical and Virtual Environments
NEW QUESTION # 22
What is the composition of PowerMax TDATs?
- A. 64 equal chunks per disk
- B. 64 slices per disk
- C. 64 cylinders per disk
- D. 64 hypers per disk
Answer: A
Explanation:
In PowerMax, each RAID group is divided into 64 logical blocks known as TDATs (Thin Device Addressable Tracks). Each TDAT is configured to hold data at a given data reduction level, from 1:1 uncompressed data all the way to 16:11. Reference: Data Protection Schemes | Dell PowerMax: Reliability, Availability, and Serviceability | Dell Technologies Info Hub
NEW QUESTION # 23
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?
- A. Suspended
- B. Active Active
- C. Active Bias
- D. Partitioned
Answer: C
Explanation:
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.
Reference:
SRDF/Metro overview
VMware vSphere Metro Storage Cluster (vMSC) with Dell PowerMax and Dell EMC VMAX SRDF/Metro Understanding bias
NEW QUESTION # 24
vWitness and Array Witness options are deployed in the same operating environment simultaneously.
Which option does SRDF/Metro favor in this situation?
- A. Witness
- B. Device Bias
- C. Array Witness
- D. Smart DR
Answer: A
Explanation:
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.
NEW QUESTION # 25
An administrator has added custom SSL certificates. Each time a client connection is made, default certificates are used.
Which step must be completed?
- A. manage server cert update
- B. security_cert_allow wildcards
- C. svmcfq discover
- D. restart storsrvd
Answer: D
Explanation:
If an administrator has added custom SSL certificates and each time a client connection is made, default certificates are used, then 'restart storsrvd' must be completed. This is because changes to SSL certificates often require a restart of the service that uses them in order for the new certificates to be correctly loaded and used for future client connections1.
NEW QUESTION # 26
A company plans to implement SRDF/Star. It is currently using SRDF/S between their two data centers. It is setting up a third data center and wants to have at least two identical copies of its data in case of a primary site failure.
What condition is needed for the connection between the first two sites and the third site?
- A. The link must be able to transport the delta set of the RPO within the company's RTO
- B. Distance cannot exceed 200 kilometers
- C. Latency cannot exceed 40 ms
- D. Any link capable of transporting data with a maximum latency of 15 seconds
Answer: A
Explanation:
A company plans to implement SRDF/Star, which is a three-site replication solution that provides continuous data protection and disaster recovery capabilities. It is currently using SRDF/S between their two data centers, which are located within 200 kilometers and use synchronous replication. It is setting up a third data center and wants to have at least two identical copies of its data in case of a primary site failure. The third site can be located anywhere in the world and use asynchronous replication. The condition that is needed for the connection between the first two sites and the third site is that the link must be able to transport the delta set of the Recovery Point Objective (RPO) within the company's Recovery Time Objective (RTO). The delta set is the amount of data that has changed since the last successful replication cycle. The RPO is the maximum acceptable amount of data loss measured in time. The RTO is the maximum acceptable amount of time to restore normal operations after a disaster. The link must have enough bandwidth and latency to ensure that the delta set can be transferred within the RTO without exceeding the RPO.
Reference:
SRDF Star software uses and best practices
SRDF/STAR
Remote replication using SRDF
NEW QUESTION # 27
NDM is being used to migrate some Windows hosts to a new PowerMax. The client doesn't want the migration target volumes to retain the source volume external device identity following the migration.
What should be used to complete the migration and address the client's concern?
- A. NDM metro-based mode
- B. NDM cancel revert function
- C. NDM Updates feature
- D. NDM pass-through mode
Answer: C
Explanation:
The NDM Updates feature should be used to complete the migration and address the client's concern. The NDM Updates feature is designed to help automate the process of moving applications across arrays requiring a short application downtime. It allows application migration from a VMAX (5876) array to a VMAX3 (5977), VMAX All Flash (5978), or PowerMax (5978) array1. It supports pre-sync data between arrays and then schedule downtime to do the cutover1. Reference: Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide
NEW QUESTION # 28
A storage administrator migrated an AIX host using NDM.
When they commit the migration, how is host access to the source array removed?
- A. Source volumes are set NR
- B. Old host paths are set NR
- C. Masking view is deleted
- D. Source volumes are deleted
Answer: C
Explanation:
During a Non-Disruptive Migration (NDM), when the migration is committed, the host access to the source array is removed by deleting the masking view. The masking view is a logical grouping of host initiators, storage ports, and a storage group (which contains volumes). Deleting the masking view removes the host's access to the volumes on the source array12. Reference: Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide, VMAX/PowerMax Non-Disruptive Migration (NDM) for the IBMi host platform | Dell US Support Knowledge Base Article
NEW QUESTION # 29
What is a requirement for the SRDF/Metro devices for an SRDF/Metro personality swap?
- A. Must be WD on the link
- B. Must be in partitioned state
- C. Must be in suspended state
- D. Must be RW on the link
Answer: D
Explanation:
For an SRDF/Metro personality swap, the SRDF/Metro devices must be Read/Write (RW) on the link. This ensures that data can be read from and written to the devices during the swap operation.
NEW QUESTION # 30
Which is correct about Unisphere for PowerMax and Solutions Enabler permission management?
- A. Unisphere has a more explicit authentication mechanism for users Solutions Enabler uses the operating system user credentials
- B. Unisphere and Solutions Enabler permission information is maintained in separate symauth databases.
- C. Unisphere and Solutions Enabler have authorization checking disabled by default
- D. Unisphere can assign a maximum of two roles per user Solutions Enabler can assign up to four roles per user
Answer: A
Explanation:
Unisphere for PowerMax and Solutions Enabler have different ways of managing user permissions. Unisphere has a more explicit authentication mechanism for users, where each user must have a username and password to log in to the Unisphere interface. Unisphere also supports role-based access control (RBAC), where each user can be assigned one or more roles that define their level of access to the storage system resources and operations. Unisphere maintains the user and role information in a symauth database, which can be shared with Solutions Enabler. Solutions Enabler, on the other hand, uses the operating system user credentials to authenticate users. Solutions Enabler does not require users to have a username and password to run commands, but it checks the symauth database to verify if the user has the appropriate role to perform the requested operation. Solutions Enabler also supports RBAC, where each user can be assigned up to four roles that define their level of access to the storage system resources and operations.
Reference:
Unisphere for PowerMax User Management
Solutions Enabler User Management
NEW QUESTION # 31
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%?
- A. A=15, B=50
- B. B=40, A=10
- C. A=10, B=40
- D. B=15.A=15
Answer: C
Explanation:
If utilization increases by 10% for both systems A and B, where system A has a current utilization of 10% and system B has a current utilization of 70%, the response times for systems A and B would not necessarily increase linearly with utilization. The exact impact on response times would depend on various factors including workload characteristics, system configuration, and resource contention among others34. However, without specific details on these factors, it's not possible to provide an accurate prediction for the new response times. Reference: PowerMax and VMAX All Flash: Storage Resource Pool (SRP) Effective Used Capacity threshold alert, Service levels and eNAS | Dell EMC PowerMax and VMAX All Flash: eNAS Best Practices
NEW QUESTION # 32
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?
- A. Set copy to URGENT
- B. Relink without the -copy option
- C. Set copy pace 16
- D. Relink with the -precopy option
Answer: D
Explanation:
The -precopy option in the relink command 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.
NEW QUESTION # 33
During a Non-Disruptive Migration (NDM), what is the result of issuing the ReadyTgt SYMCLI command to the migrating Storage Group?
- A. Source Masking View is removed so the original source paths are in a dead state
- B. Completes the migration by removing the migrated application resources from the source array
- C. Masking View is created on the target array using elements that are created during the create command
- D. Confirms that both the source and target arrays can support IDM operations
Answer: B
Explanation:
During a Non-Disruptive Migration (NDM), issuing the ReadyTgt SYMCLI command to the migrating Storage Group completes the migration by removing the migrated application resources from the source array2. This command is typically issued after all data has been synchronized from the source to the target array and application I/O has been switched to the target array2. Reference: NDM overview | Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide | Dell Technologies Info Hub
NEW QUESTION # 34
SRDF/Metro has been deployed and is operating normally. Maintenance tasks at the R1 data center require the array to be offline.
Which SRDF operation should be executed on the Metro RDF pairs to facilitate the planned outage without affecting application I/O?
- A. Failover
- B. Swap
- C. Split with bias set to R2
- D. Suspend with bias set to R2
Answer: B
Explanation:
When maintenance tasks at the R1 data center require the array to be offline, a Swap operation should be executed on the Metro RDF pairs. This operation allows for a planned outage without affecting application I/O by swapping the roles of R1 and R2 devices.
NEW QUESTION # 35
A company has two PowerMax arrays located 100 km apart. The arrays are configured with SRDF/S over Fibre Channel.
Which Dell EMC technology improves FC replication between sites?
- A. Deduplication
- B. SIRT
- C. Fast Write
- D. Write Acceleration
Answer: C
Explanation:
Fast Write is a Dell EMC technology that improves Fibre Channel (FC) replication between sites in a SRDF/S configuration. When a write I/O is issued by the host to the R1 device, SRDF with Fast Write acknowledges the write to the host as soon as the data is stored in the R1's cache and transmitted to the R2's cache. This results in reduced latency and improved performance for FC replication between sites.
https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h17118_dell_emc_powermax_family_overview.pdf
https://infohub.delltechnologies.com/l/dell-emc-powermax-and-vmax-all-flash-srdf-metro-overview-and-best-practices-1/srdf-metro-overview/
NEW QUESTION # 36
What environment includes R11 devices?
- A. SRDF/AR
- B. Concurrent SRDF
- C. SRDF/CE
- D. Cascaded SRDF
Answer: D
Explanation:
R11 devices are included in a Cascaded SRDF environment. In a cascaded SRDF configuration, the R1 device at the primary site is paired with an R11 device at the secondary site, which is then paired with an R2 device at the tertiary site2. Reference: NDM overview | Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide | Dell Technologies Info Hub
NEW QUESTION # 37
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