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質問 # 19
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 # 20
Match Dual Personally SRDF device to its usage SRDF role.
正解：
解説：
Reference:
Dell EMC SRDF Introduction - Dell Technologies Partner Portal
Dell EMC PowerMax and VMAX All Flash: SRDF Product Guide
Dell EMC PowerMaxOS Performance Guide
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. A=15, B=50
- C. B=40, A=10
- D. A=10, B=40
正解：D
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 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. Queue depth full event
- C. Performance thresholds were exceeded
- D. Host queue depth setting was changed
正解：A
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 # 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. Swap
- B. Suspend with bias set to R2
- C. Split with bias set to R2
- D. Failover
正解：A
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 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 # 25
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 # 26
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 the same directors
- B. Redistribute the application to other front-end host ports on different 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：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 # 27
A customer's security administrator needs to configure Access Control.
What must they do prior to performing this operation?
- A. Configure Access Controls for internal system user and Guest OS
- B. Enable SYMACL on the Management Module Control Station
- C. Define the User Access ID for the Admin User
- D. Log in to the host as a member of the AdminGrp
正解：C
解説：
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
質問 # 28
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. restart storsrvd
- D. svmcfq discover
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 # 29
A host is issuing I/O to a PowerMax.
What happens if the cache space fills up?
- A. Cache is temporarily disabled
- B. I/O will be serviced at the speed of the destination device
- C. I/O will be queued until an empty cache slot is available
- D. Cache is permanently flushed
正解：C
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 # 30
What is the composition of PowerMax TDATs?
- A. 64 equal chunks per disk
- B. 64 slices per disk
- C. 64 hypers per disk
- D. 64 cylinders 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 # 31
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 # 32
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 partitioned state
- D. Must be in suspended 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 # 33
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 - Informational, 10 ms. 2nd level - Warning, 15 ms
- B. 1st level-Warning, 11 ms 2nd level - Critical, 16 ms
- C. 1st level - Warning, 10 ms 2nd level - Critical, 15 ms
- D. 1st level - informational, 9 ms 2nd level - Warning, 14 ms
正解：C
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 # 34
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