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質問 # 24
Alerts are required to track high I/O response times for a specific storage group. I/O Response times greater than 10 ms require next day analysis. I/O response times greater than 15 ms require immediate intervention.
Which alert settings are required?
- A. 1st level - Warning, 10 ms 2nd level - Critical, 15 ms
- B. 1st level - Informational, 10 ms. 2nd level - Warning, 15 ms
- C. 1st level - informational, 9 ms 2nd level - Warning, 14 ms
- D. 1st level-Warning, 11 ms 2nd level - Critical, 16 ms
正解：A
解説：
The alert settings required are a first level warning at 10 ms and a second level critical alert at 15 ms. These settings will ensure that high I/O response times for a specific storage group are tracked and appropriate actions are taken when the response times exceed the specified thresholds. Reference: Dell EMC PowerMax: Service Levels for PowerMaxOS
質問 # 25
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. LocalRep and Monitor
- B. Auditor and
- C. RemoteRep Only
- D. SecuritvAdmin only
正解：C
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 # 26
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 can assign a maximum of two roles per user Solutions Enabler can assign up to four roles per user
- D. Unisphere and Solutions Enabler permission information is maintained in separate symauth databases.
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 # 27
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. Host network interface card was replaced
- C. SYMAPI options file was manually modified with the wrong host ID.
- D. symacl -unique -passphrase was run using a different passphrase
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 # 28
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. Fast Write
- B. Deduplication
- C. SIRT
- D. Write Acceleration
正解：A
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 # 29
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. Suspend with bias set to R2
- B. Swap
- C. Split with bias set to R2
- D. Failover
正解：B
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 # 30
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. Confirms that both the source and target arrays can support IDM operations
- D. Masking View is created on the target array using elements that are created during the create command
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 # 31
What environment includes R11 devices?
- A. Concurrent SRDF
- B. SRDF/AR
- C. Cascaded SRDF
- D. SRDF/CE
正解：C
解説：
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
質問 # 32
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. 2x 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 brick one
- D. 1x RAID 5 (7+1) added to each brick
正解：D
解説：
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
質問 # 33
Refer to exhibit.
Refer to the exhibit.
SRDF device pairs are suspended by the administrator.
Which symrdf command was issued next?
- A. svmdrfhalf swap
- B. symrdf set bias
- C. svmrdf split
- D. symrdf swap
正解：C
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 # 34
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 # 35
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：A
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 # 36
If the host is cross connected in an SRDF/Metro configuration, what happens if the R2 device becomes Not Ready?
- A. Loses read/write access to both devices
- B. Read-only access is available to only the R1 device
- C. Continues to have read/write access to the R1 device
- D. Read-only access is available to both devices
正解：C
解説：
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
質問 # 37
A company wants to implement a three-site disaster recovery solution. It is considering a Concurrent SRDF/Star environment where the production data on R11 devices are replicated to two R2 devices in two remote arrays. Site 2 will use SRDF/S links, and Site 3 will use SRDF/A links from Site 1.
What is the correct configuration for recovery links?
- A. SRDF/A links must be configured between Site 1 and Site 2
- B. SRDF/A links must be configured between Site 3 and Site 2
- C. SRDF/S links must be configured between Site 1 and Site 3
- D. SRDF/S links must be configured between Site 3 and Site 2
正解：D
解説：
In a Concurrent SRDF/Star environment where the production data on R11 devices are replicated to two R2 devices in two remote arrays, SRDF/S links must be configured between Site 3 and Site 2. 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, SRDF Star software uses and best practices - Dell
質問 # 38
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. All the SRDF Groups must be defined and in suspended state
- B. All SRDF/Star device pairs must be of the same geometry and size
- C. SRDF Groups cannot be shared between SRDF/Star configurations
- D. The asynchronous PowerMax requires twice the SRDF directors compared to the two synchronous arrays
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 # 39
A drive failure has occurred at a customer environment, and a service request has been opened with customer support. A drive failure has occurred at a customer environment, and a service request has been opened with customer support.
Order the steps in sequence as part of key management.
正解：
解説：
1 - Spare drive invoked against failed drive
2 - 1st entry in audit log
3 - Sparing operation is completed
4 - Key is deleted from the repository when failed drive is removed
5 - 2nd entry in audit log
6 - Key is generated for replacement drive when installed
Reference:
Dell EMC PowerMax and VMAX All Flash: Data at Rest Encryption
質問 # 40
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
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 # 41
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 lower level of service
- B. Redistribute the application to other front-end host ports on different directors
- C. Redistribute the application to other front-end host ports on the same directors
- D. Adjust the Service Level to a higher level of service
正解：B
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 # 42
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 # 43
Which external storage can be connected to PowerMax using DX emulation?
- A. Compellent
- B. Unity
- C. PowerStore
- 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 # 44
What is a requirement for the SRDF/Metro devices for an SRDF/Metro personality swap?
- A. Must be RW on the link
- B. Must be WD on the link
- C. Must be in suspended state
- D. Must be in partitioned state
正解：A
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 # 45
A host is issuing I/O to a PowerMax.
What happens if the cache space fills up?
- A. Cache is permanently flushed
- B. I/O will be serviced at the speed of the destination device
- C. Cache is temporarily disabled
- D. I/O will be queued until an empty cache slot is available
正解：D
解説：
When the cache space fills up, I/O will be queued until an empty cache slot is available. This is because PowerMax operates as a cache-centric architecture, where all data is passed through cache before being stored on disk. Cache is used to buffer incoming and outgoing data, as well as to support various functions such as replication and data reduction. When cache is full, the array cannot accept any more data until some cache slots are freed up by flushing data to disk or invalidating stale data. Therefore, answer B is correct.
A, C, and D are incorrect because they do not describe what happens when cache space fills up. I/O will not be serviced at the speed of the destination device (A), as this would bypass the cache and degrade performance. Cache is not permanently flushed or temporarily disabled (D), as this would result in data loss or corruption.
質問 # 46
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