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NEW QUESTION # 16
Refer to the exhibit.
What should be done first to recover from this Concurrent SRDF/Star configuration failure?
- A. Reset the 2nd Target Site
- B. Reset the 1st Target Site
- C. Disable Star
- D. Switch to the 1st Target Site
Answer: D
Explanation:
In a Concurrent SRDF/Star configuration failure, the first step to recover is to switch to the 1st Target Site. This is because in a Concurrent SRDF/Star configuration, there are two target sites and one source site. If there's a failure, the source site can switch to either of the target sites based on the business continuity plan1. Reference: Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide
NEW QUESTION # 17
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 pass-through mode
- B. NDM metro-based mode
- C. NDM cancel revert function
- D. NDM Updates feature
Answer: D
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 # 18
What is the minimum number of samples that must be collected via a single Real Time Trace collection process in Unisphere for PowerMax?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
The minimum number of samples that must be collected via a single Real Time Trace collection process in Unisphere for PowerMax is 1040. This is because the Real Time Trace feature allows the user to collect performance data at 30-second intervals for up to 8 hours, which results in 1040 samples (8 x 60 x 60 / 30 = 1040). The Real Time Trace feature can be used to monitor the performance of storage groups, directors, ports, or devices at a granular level and identify any potential issues or bottlenecks.
Reference:
PowerMax Real Time SG Monitoring in Unisphere 9 0
VMAX Performance Troubleshooting with Unisphere - Run a real time trace at the system level
NEW QUESTION # 19
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. Smart DR
- C. Device Bias
- D. Array Witness
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 # 20
If the host is cross connected in an SRDF/Metro configuration, what happens if the R2 device becomes Not Ready?
- A. Read-only access is available to only the R1 device
- B. Loses read/write access to both devices
- C. Read-only access is available to both devices
- D. Continues to have read/write access to the R1 device
Answer: D
Explanation:
In an SRDF/Metro configuration, if the host is cross-connected and the R2 device becomes Not Ready, the host continues to have read/write access to the R1 device12. This is because SRDF/Metro is designed to provide high availability and continuous data access. If one device becomes inaccessible, the host can still access the other device12. Reference: SRDF/Metro | SAP Landscape Consolidation with Dell Components, Understanding bias | Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices
NEW QUESTION # 21
A disaster occurred at the workload site of an SRDF/Star configuration. The administrator decides to move the workload to the Synchronous site (Site B).
What symstar command should be used before the workload switch?
- A. halt
- B. disable
- C. cleanup
- D. unpFOlecl
Answer: A
Explanation:
The symstar halt command is used to write disable devices and synchronize SRDF data to remote sites in an SRDF/Star configuration. This command ensures that all sites have a consistent copy of data before switching the workload site from one site to another. Therefore, the symstar halt command should be used before the workload switch in case of a disaster at the workload site of an SRDF/Star configuration1
NEW QUESTION # 22
Which metrics are recommended to start analyzing the overall efficiency of the array due to cache?
- A. Cache Balance and Array-level % Hit
- B. % Reads and Host MBs Read/sec
- C. Array-level % Hit and % Cache WP
- D. %Cache WP and % Reads
Answer: C
Explanation:
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.
Reference:
System efficiency overview | Dell PowerMax: Data Reduction | Dell Technologies Info Hub Metrics (PowerMax & VMAX) - VMware Docs Dell EMC PowerMax storage Replication cache | Dell EMC PowerMax and VMAX All Flash: TimeFinder SnapVX Local Replication
NEW QUESTION # 23
A user can create, manage, and delete PowerMax SRDF device pairs. They can also view the array information, masking objects, device information, and the defined RBAC rules. However, they are unable to create and delete SRDF groups.
Which RBAC profile has been assigned to the user's profile?
- A. RemoteRep Only
- B. SecuritvAdmin only
- C. Auditor and
- D. LocalRep and Monitor
Answer: A
Explanation:
The user has been assigned the RemoteRep role only. The RemoteRep role allows users to create, manage, and delete SRDF device pairs, as well as view array information, masking objects, device information, and RBAC rules2. However, it does not allow users to create and delete SRDF groups, which requires the StorageAdmin role. Therefore, answer C is correct.
A, B, and D are incorrect because they do not match the user's profile. SecurityAdmin (A) role allows users to manage security settings such as authentication methods, certificates, RBAC rules, and audit logs2. Auditor (B) role allows users to view array information and audit logs only2. LocalRep (D) role allows users to create, manage, and delete TimeFinder SnapVX sessions from a source device2. None of these roles allow users to create and delete SRDF device pairs.
NEW QUESTION # 24
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. Any link capable of transporting data with a maximum latency of 15 seconds
- B. Latency cannot exceed 40 ms
- C. Distance cannot exceed 200 kilometers
- D. The link must be able to transport the delta set of the RPO within the company's RTO
Answer: D
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 # 25
What is the correct sequence of actions that take place on a Write Miss?
Answer:
Explanation:
1 - Host sends requests to FE director and no cache slots are found
2 - FE finds available slot by polling
3 - FE sends data from host to mirrored cache locations
4 - FE responds to host to acknowledge successful write
5 - BE destages data as a high-priority task to make slots available
6 - BF destages new data to disk at a later time
NEW QUESTION # 26
Which external storage can be connected to PowerMax using DX emulation?
- A. Compellent
- B. Unity
- C. PowerStore
- D. Data Domain
Answer: D
Explanation:
Data Domain is the only external storage that can be connected to PowerMax using DX emulation. DX emulation is a specialized back-end DA emulation that handles SAN attached disks. DX directors are configured on existing PowerMax front-end Fibre Channel ports and are required to be implemented in pairs for high availability. DX emulation is used to support ProtectPoint technology, which integrates primary storage with Data Domain protection storage to accelerate backup and recovery. Therefore, answer A is correct1.
B, C, and D are incorrect because they are not external storage that can be connected to PowerMax using DX emulation. Unity (B), PowerStore , and Compellent (D) are primary storage arrays that do not support ProtectPoint technology or DX emulation.
NEW QUESTION # 27
A customer's security administrator needs to configure Access Control.
What must they do prior to performing this operation?
- A. Enable SYMACL on the Management Module Control Station
- B. Configure Access Controls for internal system user and Guest OS
- C. Log in to the host as a member of the AdminGrp
- D. Define the User Access ID for the Admin User
Answer: D
Explanation:
Before configuring Access Control, the security administrator must define the User Access ID for the Admin User. This is a necessary step to ensure that the administrator has the necessary permissions to perform this operation.
PowerMax & VMAX All-Flash Storage Technical Documentation, Dell EMC PowerMax and VMAX All Flash: Embedded Management
NEW QUESTION # 28
Which KPIs should be reviewed when analyzing BE performance using the PowerMax array?
- A. Reqs/sec and IOPS
- B. %Busy and Balance
- C. Balance and Reqs/sec
- D. IOPS and Utilization
Answer: B
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 # 29
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. SIRT
- B. Write Acceleration
- C. Deduplication
- D. Fast Write
Answer: D
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 # 30
An administrator implemented SYMACLs on a PowerMax using host-based Access IDs. The administrator is no longer able to run SYMCLI commands against the volumes belonging to a host.
What is a possible reason for this issue?
- A. Host network interface card was replaced
- B. SYMAPI options file was manually modified with the wrong host ID.
- C. symacl -unique -passphrase was run using a different passphrase
- D. The disks the volumes were on were replaced
Answer: B
Explanation:
If an administrator implemented SYMACLs on a PowerMax using host-based Access IDs and is no longer able to run SYMCLI commands against the volumes belonging to a host, one possible reason could be that the SYMAPI options file was manually modified with the wrong host ID. The SYMAPI options file contains configuration settings for Solutions Enabler, including host IDs for access control. If this file is incorrectly modified, it could prevent the administrator from running SYMCLI commands against certain volumes34. Reference: Dell EMC PowerMax and VMAX All Flash: Embedded Management, Role Based Access Control on PowerMax - Storage Intelligence
NEW QUESTION # 31
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 # 32
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