最新 [2024年06月24日]DEE-1111試験正確解答Expert - PowerMax and VMAX Family Solutions ExamのPDF問題
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質問 # 11
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. The link must be able to transport the delta set of the RPO within the company's RTO
- D. Distance cannot exceed 200 kilometers
正解：C
解説：
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
質問 # 12
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
正解：B
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 # 13
An organization has PowerMax systems on three sites. They plan to implement SRDF/Star to provide remote protection.
What is a restriction for an SRDF/Star configuration?
- A. SRDF Groups cannot be shared between SRDF/Star configurations
- B. All SRDF/Star device pairs must be of the same geometry and size
- C. The asynchronous PowerMax requires twice the SRDF directors compared to the two synchronous arrays
- D. All the SRDF Groups must be defined and in suspended state
正解：B
解説：
In an SRDF/Star configuration, all SRDF/Star device pairs must be of the same geometry and size. This is because SRDF/Star uses concurrent SRDF to maintain synchronous and asynchronous SRDF sessions between three arrays. The devices in these sessions must have identical geometry to ensure data consistency56. Reference: Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide, SRDF/Metro overview | Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices
質問 # 14
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. Auditor and
- C. SecuritvAdmin only
- D. LocalRep and Monitor
正解：A
解説：
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.
質問 # 15
What is the correct sequence of actions that take place on a Write Miss?
正解：
解説：
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
質問 # 16
Refer to exhibit.
Refer to the exhibit.
SRDF device pairs are suspended by the administrator.
Which symrdf command was issued next?
- A. svmrdf split
- B. symrdf set bias
- C. svmdrfhalf swap
- D. symrdf swap
正解：A
解説：
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
質問 # 17
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. Fast Write
- C. Write Acceleration
- D. Deduplication
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 # 18
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. Relink with the -precopy option
- B. Set copy to URGENT
- C. Set copy pace 16
- D. Relink without the -copy option
正解：A
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 # 19
Which feature of PowerMax and VMAX All Flash arrays provides ORM functionality?
- A. Parallel prefetch
- B. Write coalescing
- C. Write folding
- D. FlashBoost
正解：B
解説：
The feature of PowerMax and VMAX All Flash arrays that provides ORM functionality is write coalescing. ORM stands for Optimized Resource Management, which is a set of technologies that optimize the performance and efficiency of flash storage. Write coalescing is one of the ORM technologies that reduces the write amplification and extends the life of flash drives. Write coalescing combines multiple small writes into larger sequential writes before destaging them to the flash drives. This reduces the number of write operations and the amount of data that needs to be erased and rewritten on the flash drives, which improves the performance and endurance of the flash storage.
Reference:
Dell EMC PowerMax: Family Overview
Dell EMC PowerMax and VMAX All Flash: Data Reduction
Dell EMC PowerMax and VMAX All Flash: Embedded Management
質問 # 20
What is a requirement for the SRDF/Metro devices for an SRDF/Metro personality swap?
- A. Must be in suspended state
- B. Must be in partitioned state
- C. Must be WD on the link
- D. Must be RW on the link
正解：D
解説：
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.
質問 # 21
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. B=15.A=15
- B. B=40, A=10
- C. A=10, B=40
- D. A=15, B=50
正解：C
解説：
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
質問 # 22
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 deleted
- B. Old host paths are set NR
- C. Masking view is deleted
- D. Source volumes are set NR
正解：C
解説：
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
質問 # 23
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. Split with bias set to R2
- C. Swap
- D. Suspend with bias set to R2
正解：C
解説：
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.
質問 # 24
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. Adjust the Service Level to a higher level of service
- B. Adjust the Service Level to a lower level of service
- C. Redistribute the application to other front-end host ports on different directors
- D. Redistribute the application to other front-end host ports on the same directors
正解：C
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 # 25
An application server has the following data characteristics:
80% of the I/O is generated with 8 KB random small blocks
20% of the I/O is generated with 64 KB sequential large blocks
50% of all I/O is a write
What workload profile do these data characteristics represent?
- A. DCS
- B. OLTP
- C. RRH
- D. RWM
正解：B
解説：
The data characteristics represent an Online Transaction Processing (OLTP) workload profile. OLTP workloads typically consist of a high percentage of small, random I/O operations2. In this case, 80% of the I/O is generated with 8 KB random small blocks, which is characteristic of OLTP workloads2. Reference: Use DISKSPD to test workload storage performance - Azure Stack HCI | Microsoft Learn
質問 # 26
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. symacl -unique -passphrase was run using a different passphrase
- C. SYMAPI options file was manually modified with the wrong host ID.
- D. The disks the volumes were on were replaced
正解：C
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 # 27
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. Performance thresholds were exceeded
- B. Queue depth full event
- C. Noisy Neighbor issue
- D. Host queue depth setting was changed
正解：C
解説：
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.
質問 # 28
Which external storage can be connected to PowerMax using DX emulation?
- A. Compellent
- B. PowerStore
- C. Unity
- D. Data Domain
正解：D
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 # 29
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 have authorization checking disabled by default
- C. Unisphere and Solutions Enabler permission information is maintained in separate symauth databases.
- D. Unisphere can assign a maximum of two roles per user Solutions Enabler can assign up to four roles per user
正解：A
解説：
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
質問 # 30
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 full read/write capability to the application
- B. Has only read capability to the application
- C. Goes Not Ready to the host
- D. Bias is applied
正解：A
解説：
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
質問 # 31
An SRDF/Metro Smart DR configuration experiences a service interruption.
What criteria will the Fault-Aware Witness give a higher priority to when selecting the winning array?
- A. Synced SRDF/A leg
- B. Director status
- C. Bias
- D. Presence of a DR leq
正解：C
解説：
In an SRDF/Metro Smart DR configuration, the Fault-Aware Witness gives a higher priority to Bias when selecting the winning array. The bias settings for the devices are used to determine the preferred winner in the event of a failure2. The preferred winner is the side that has priority when requesting the lock from the witness instance2. Reference: Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices
質問 # 32
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. Partitioned
- C. Active Active
- D. Active Bias
正解：D
解説：
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
質問 # 33
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