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質問 # 28
Refer to exhibit.
Refer to the exhibit.
Which correctly describes a possible configuration created by SYMACL?
- A. Only BASECNTROL access type
- B. Physical hosts that are part of EmcMgmtGrp group
- C. Only ADMINRD access type
- D. Hosts that are part of AdminGrp proup
正解：D
解説：
The symauth command is used to manage user authorization for SYMCLI commands. The exhibit shows the output of the symauth -list command, which displays the user groups and access types defined for SYMCLI commands. The output shows that there are two user groups: AdminGrp and EmcMgmtGrp. The AdminGrp group has ADMINRD access type, which means that users in this group can run any SYMCLI command with read-only access. The EmcMgmtGrp group has BASECONTROL access type, which means that users in this group can run only a subset of SYMCLI commands with read/write access. Therefore, the correct description of a possible configuration created by SYMACL is hosts that are part of AdminGrp group2
質問 # 29
An administrator is trying to view the SLO Compliance Report but is unable to find data for an issue that occurred 7 months ago.
What is the maximum retention period?
- A. Last month
- B. Last 2 weeks
- C. 6 months
- D. 3 months
正解：C
解説：
The maximum retention period for the SLO Compliance Report is 6 months. This means that data older than 6 months will not be available in the report
質問 # 30
What is the maximum number of SCM RAID groups that can be added to a two-engine PowerMax 2000?
- A. 0
- B. 1
- C. 2
- D. 3
正解：C
解説：
the maximum number of SCM RAID groups that can be added to a two-engine PowerMax 2000 would depend on various factors including the specific configuration of the system and the capacity requirements.
質問 # 31
Which two factors define Capacity Management?
- A. Storage capacity and number of SCM drives
- B. Number of FE ports and number of SCM drives
B Number of BE ports and I/O capacity - C. I/O capacity and storage capacity
正解：C
解説：
The two factors that define Capacity Management are I/O capacity and storage capacity. I/O capacity refers to the ability of the system to handle the incoming and outgoing data traffic from the hosts or applications. Storage capacity refers to the amount of disk space available to store the data. Capacity Management is the process of planning, monitoring, and optimizing the use of these resources to ensure optimal performance, availability, and efficiency of the system.
Reference:
Dell EMC PowerMax: Family Overview
System Resource Usage
質問 # 32
An administrator is configuring SYMACL on a PowerMax array.
What are possible ways to get a unique ID for a host system?
- A. Derived from storage array hardware configuration From a passphrase
- B. Derived from host-based passphrase Randomly generated by Solutions Enabler lockbox file
- C. Derived from host hardware configuration Randomly generated
- D. Derived from SAN domain ID Derived from local disk configuration
正解：B
解説：
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.
Reference:
symacl -unique : Unable to obtain unique ID for host - Dell
EMC - Symmetrix Access Control - symacl | SANSPIRE
How to identify hostname and host ID for license generation
質問 # 33
An application owner is experiencing performance issues for their application. Unisphere for PowerMax is showing the storage group is compliant with the current Service Level.
How should the performance issue be addressed?
- A. Redistribute the application to other front-end host ports on different directors
- B. Redistribute the application to other front-end host ports on the same directors
- C. Adjust the Service Level to a higher level of service
- D. Adjust the Service Level to a lower level of service
正解：A
解説：
An application owner is experiencing performance issues for their application. Unisphere for PowerMax is showing the storage group is compliant with the current Service Level. This means that the performance issue is not caused by the storage system, but by some other factor in the environment, such as network congestion, host configuration, or application workload. One possible way to address the performance issue is to redistribute the application to other front-end host ports on different directors. This can help balance the workload across multiple paths and avoid potential bottlenecks or contention on a single port or director. Unisphere for PowerMax provides a Performance Plan feature that can analyze the current configuration and suggest optimal port allocation for each storage group based on historical data and best practices.
Reference:
Understanding Performance Management
Dell EMC PowerMaxOS Performance Guide
質問 # 34
Refer to the exhibit.
What should be done first to recover from this Concurrent SRDF/Star configuration failure?
- A. Switch to the 1st Target Site
- B. Reset the 2nd Target Site
- C. Reset the 1st Target Site
- D. Disable Star
正解：A
解説：
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
質問 # 35
During a Non-Disruptive Migration (NDM), what is the result of issuing the ReadyTgt SYMCLI command to the migrating Storage Group?
- A. Masking View is created on the target array using elements that are created during the create command
- B. Confirms that both the source and target arrays can support IDM operations
- C. Source Masking View is removed so the original source paths are in a dead state
- D. Completes the migration by removing the migrated application resources from the source array
正解：D
解説：
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
質問 # 36
Which external storage can be connected to PowerMax using DX emulation?
- A. Compellent
- B. Data Domain
- C. PowerStore
- D. Unity
正解：B
解説：
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.
質問 # 37
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 pace 16
- B. Relink with the -precopy option
- C. Relink without the -copy option
- D. Set copy to URGENT
正解：B
解説：
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.
質問 # 38
An administrator has added custom SSL certificates. Each time a client connection is made, default certificates are used.
Which step must be completed?
- A. svmcfq discover
- B. manage server cert update
- C. restart storsrvd
- D. security_cert_allow wildcards
正解：C
解説：
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.
質問 # 39
What is the composition of PowerMax TDATs?
- A. 64 equal chunks per disk
- B. 64 cylinders per disk
- C. 64 slices per disk
- D. 64 hypers per disk
正解：A
解説：
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
質問 # 40
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. Write Acceleration
- B. Fast Write
- C. Deduplication
- D. SIRT
正解：B
解説：
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/
質問 # 41
What is the correct sequence of steps to configure and bring up an SRDF/Star environment?
正解：
解説：
1 - Verify SRDF/Star control host connectivity and array settings
2 - Enable SRDF/Star configuration
3 - Add BCV devices to the SRDF/Star configuration
4 - Create an SRDF/Star composite group and options file
5 - Perform the symstar setup operation and create composite groups on target sites Reference:
Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide
質問 # 42
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. The disks the volumes were on were replaced
- B. symacl -unique -passphrase was run using a different passphrase
- C. Host network interface card was replaced
- D. SYMAPI options file was manually modified with the wrong host ID.
正解：D
解説：
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
質問 # 43
Refer to exhibit.
The RDF-ECA timer has expired.
What is the state of all the RDF links?
- A. suspend
- B. online
- C. failed over
- D. split
正解：A
解説：
When the RDF-ECA timer expires, all RDF links will be in a 'Suspend' state. This is because the RDF-ECA timer is used to control how long SRDF waits for an acknowledgement from the remote array before it suspends the link. If an acknowledgement is not received within this time, SRDF assumes that there is a problem with the link or remote array and suspends the link to prevent data loss or corruption.
質問 # 44
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
正解：A
解説：
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.
質問 # 45
During a Non-Disruptive Migration (NDM), what is the result of issuing the ReadyTgt SYMCLI command to the migrating Storage Group?
- A. Masking View is created on the target array using elements that are created during the create command
- B. Confirms that both the source and target arrays can support IDM operations
- C. Source Masking View is removed so the original source paths are in a dead state
- D. Completes the migration by removing the migrated application resources from the source array
正解：D
解説：
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
質問 # 46
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