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Dell PowerMax and VMAX Family Solutions Design 2023 > PRACTICE QUESTIONS > Flashcards

PRACTICE QUESTIONS Flashcards

1
Q

An architect is configuring BCSD to design SRDF/S between two new PowerMax arrays. The architect
has completed the tasks for the local side of the solution, including RA Port Group, Replication
Group, and site switch.
What is the correct order of steps the architect needs to take to complete the SRDF setup?

A

configure network circuit

configure remote site switch

create remote array

create remote replication group

create remote RA group

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2
Q

When implementing SRDF/Metro with Array Witness, what is a requirement of the witness array?

A

Two RDF groups with source and target devices

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3
Q

A storage administrator uses Unisphere for PowerMax to provision new storage from a VMAX All
Flash array. Which Workload Type is recommended for a combination of small and large block I/O
workloads?

A

None

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4
Q

What is a characteristic of a Secure Snapshot?

A

The Secure Snapshot remains secure after its expiration date, as long as it is linked

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5
Q

How many hosts are supported by PowerPath and PowerPath/VE in the FX software package?

A

75

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6
Q

An architect uses the following command to collect data from a HP-UX host when designing a
solution in BCSD:
sar d b interval count&raquo_space; hostname.sar.date.txt
What does the b flag in the command represent?

A

Buffer

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7
Q

What happens to the space used for SnapVX delta tracks that are unique to a terminated snapshot?

A

Returned to SRP only if it is mentioned explicitly

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8
Q

The Reserved Capacity for a Storage Resource Pool (SRP) on a VMAX All Flash array is set to 15%. A
TimeFinder SnapVX snapshot is created for a Storage Group containing 10 devices. An application is
actively performing read and write I/O to these devices. Allocation for the SRP reaches 85%.
What happens to the snapshot?

A

Snapshot terminates

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9
Q

Which director emulating performs internal array operations and provides data services?

A

DS

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10
Q

A storage architect is demonstrating to a customer how they can register vCenter and ESXi servers,
view all relevant storage related objects of an ESXi server, and troubleshoot storage performance.
Which system view in Unisphere can be used to do these things?

A

vSphere

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11
Q

Which legacy modes are supported in TimeFinder SnapVX?

A

Mirror, Clone, and VP Snap

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12
Q

An SRDF/A solution with BCSD is designed and the results are shown in the exhibit. A customer
requirement was a five-minute RPO. In the exhibit shown, the RPO is above the customer
requirement.
How can the five-minute RPO requirement be met?

A

provide more bandwidth

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13
Q

At a disaster planning meeting, an architect is presented with the following facts by a client:
A Unix host is replicating storage from a Production PowerMax to a VMAX 250FX.
RDF pairs have been split with Production and DR hosts accessing their respective storage.
Invalid tracks have started to build against PowerMax and VMAX 250FX.
The client now wants to bring production back to PowerMax, discarding the VMAX 250FX updates
while keeping the updates on the PowerMax. What is the correct action to take?

A

Failback

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14
Q

A storage architect is evaluating the performance of a PowerMax array during business hours. They
want to know how much extra load the PowerMax can handle without significant performance
degradation. The Workload Planner is used to identify the hot spots during the recurring backup
windows.
Between 9:30 PM and 1:30 AM and between 3:15 AM and 5:30 AM, backups are causing the
PowerMax to exceed the best practice recommendation. The Recurring System Data Exclusion
Periods chart is used to filter out these hot spots. After running this workload planning for a few
weeks, they notice that the selection of records they previously made are showing different numbers
than when they started viewing the report, several weeks ago.
What is the explanation for this behavior?

A
  • After two weeks the data of each time slot is refreshed with new data
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15
Q

A storage administrator is provisioning storage on a PowerMax 2000 array. The application requires
fast reads and the highest possible data protection.
Which RAID level should be recommended?

A

RAID 6 (6 + 2)

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16
Q

What is the maximum number of BTP files that can be included in a project in Sizer?

A

30

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17
Q

An architect plans to implement SRDF/A Legacy mode. What is a possible reason to do this?

A

Decoupled cycle switching between R1 and R2 arrays

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18
Q

Where is the Unisphere performance database backup file stored on the Unisphere server host?

A

\SMAS\backup\SPA

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19
Q

A PowerMax Storage Group has Host I/O limits set at 10000 IOPS. The Port Group contains four ports
across different directors. The Dynamic Distribution is set to OnFailure.
What is the maximum IOPS the Storage Group can achieve in the event a switch port being used by
one of the director ports fails but the director remains online?

A

10,000

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20
Q

What does it mean if a Storage Group is listed as “Critical” in Unisphere for VMAX?

A

Storage Group performance is below the SLO target

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21
Q

A storage administrator has completed TimeFinder SnapVX testing. The administrator is unable to terminate the TimeFinder SnapVX snapshot of the test Storage Group.

What advice should be provided to the administrator?

A

Check for linked targets

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22
Q

A storage administrator wants to verify the state of the SLO compliance application data hosted on a VMAX3. Where can the information be found in Unisphere for VMAX?

A

Storage Group Dashboard

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23
Q

A customer wants to know if they need to set the SCSI3_persist_reserve attribute for their VMAX3 devices used in a clustered environment. What information should be provided?

A

All VMAX3 thin devices have the attribute enabled by default.

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24
Q

Two RDF groups from two VMAX3 arrays have been added to a RDF Consistency Group. SRDF/A Multi-Session Consistency (MSC) has been enabled for the Consistency Group. The RDF daemon has been started on a single host that has access to both the VMAX3 arrays.

What will happen if this host becomes unavailable?

A

Cycle switching will stop

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25
Q

Which SRDF remote replication licenses are available with VMAX3?

A

Remote Replication Suite and SRDF Registered

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26
Q

When data consistency is not a requirement, which SRDF mode is preferred when replicating large volumes of data?

A

SRDF/DM

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27
Q

You are in the process of designing a VMAX3 solution with VMAX Sizer. Which parameters can be changed in a “What if Analysis”?

A

Number of Disks, Cache Size, or IOPS Growth %

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28
Q

You are designing an SRDF/A solution with BCSD and the results of the model are shown in the exhibit. The BCSD model was run with the following settings:

Source Array: VMAX 200K, 2-engine, 2 TB cache

Number of RA Ports: 4

Network Circuit: 450 MB/s

Required RPO: 5 minutes

Which conclusion can be made based on the modeling results?

A

Inadequate number of RA ports

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29
Q

How do Service Level Objectives (SLO) capacity compliance algorithms differ from Storage Resource Pools (SRP) capacity compliance algorithms?

A

SLO capacity compliance ensures data is placed on the correct drive types.

SRP capacity compliance ensures data is placed on the correct SRP.

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30
Q

After an SRDF failover operation, production work has been moved to the remote site. A large number of invalid tracks have accumulated that need to be synchronized back to the R1 volumes.

Which SRDF operation can reduce the re-synchronization time, while continuing production work on the remote site?

A

Update

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31
Q

In addition to Storage, Hosts, Performance, and Support, which other Unisphere for VMAX sections are available for selection of an individual VMAX3 array?

A

Data Protection, Systems, Applications

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32
Q

A PowerMax parent Storage Group (SG) contains two child SGs: SG1 and SG2. What is a valid Host I/O limit setting for this configuration?

A

Parent SG: 500,000 -

SG1: 400,000 -
SG2: NOLIMIT

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33
Q

A TimeFinder SnapVX snapshot of source volumes has been linked to target volumes. The target volumes are being used for application testing.

What is recommended prior to a relink operation?

A

Continue accessing the source volumes; stop accessing the target volumes

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34
Q

A VMware administrator has been tasked with managing storage for an ESXi cluster connected to a VMAX3 array. The VMware administrator is not familiar with Unisphere for VMAX and wants to use the VMware Web Client to provision VMFS datastores.

Which EMC product provides this functionality?

A

VSI Plug-in

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35
Q

What is the best practice sizing guideline for front-end (FA) utilization on a two-engine VMAX3?

A

70%

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36
Q

What happens when a SnapVX snapshot is relinked?

A

(target is refreshed with original point in time data)

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37
Q

a storage admin wants to collect data for BCSD. The company has identified peak production times and confirmed the host and array based production data statistics. What is the recommended BCSD data collection interval?

A

minimum of three days at 10 minute intervals

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38
Q

what is the best practice sizing guideline for front end FA utilization on a two-engine PowerMax array?

A

0.7

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39
Q

a storage architect wants to estimate how much additional workload VMAX All Flash Enginuity 5876 can handle. Which FAST component can be used to display application performance metrics on this storage system?

A

(Unisphere for PowerMax Workload Planner)

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40
Q

Which optional features can be added to the zFX package for mainframe?

A

GDDR and Mainframe Essentials Plus

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41
Q

While designing a SnapVX solution for a volume that is mapped to a Unix server, a storage architect decides to take three snapshots per day and retain them for six weeks. The Unix team would like to take a few on demand snapshots before and during an upgrade activity.

How many snapshots can be taken without disrupting daily snapshots?

A

130

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42
Q

Open Replicator is being used to copy data from a VNX to a PowerMax. During the migration, users experience latency when accessing the storage from the VNX.
What can be done to address the issue?

A

(reduce ceiling value)

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43
Q

An architect uses the following command to collect data from a host when designing a solution in BCSD: iostat –d –x –t interval count&raquo_space; hostname.iostat.date.txt

What does the -x flag in the command represent?

A

(Extended format)

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44
Q

What can administrators manage on a PowerMax using VSI?

A

capacity utilization

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45
Q

A Windows host has access to five LUNs presented by a PowerMax array. Snapshots are taken at 9AM. On that same day at 1PM, four volumes are added to the storage group. The snapshot is restored at 2PM.

What is the status of the newly added volumes once the restore is terminated?

A

Read/Write Enabled

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46
Q

Which role is required to rename a service level in Unisphere for PowerMax?

A

Storage Administrator

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47
Q

When adding device pairs to an SRDF/Metro configuration using the -exempt option what prevents a device pair from being added?

A

R2 device is larger than R1 device

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48
Q

a storage architect needs to make a prediction on how much additional workload a PowerMax can handle during production hours. After they run the suitability report, it appears that there is no room for any additional workload in this specific service level. after examining the performance data, they discover that a backup is running between 3 AM and 6 AM. They decide to exclude the performance during the backup window.

What should be the next step?

A

use data exclusion windows and run the planning tool

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49
Q

a storage architect is designing a PowerMax solution. The architect must customize the maximum SRDF/A cache usage. Which system view can the architect use to meet this requirement?

A

System Settings

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50
Q

What is the maximum number of bricks and drives that can be configured in a PowerMax 2000?

A

2 Bricks and 96 Drives

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51
Q

a storage architect is planning a Unisphere for PowerMax server deployment to support the maximum number of volumes and highest number of supported arrays.

How much memory is required?

A

24 GB

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52
Q

a customer has open systems, mainframe, and ibm i systems in the data center. Which arrays can be used to consolidate these independent systems into a single array?

A

PowerMax 8000 and VMAX 950F

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53
Q

By what percentage is SRDF throughput improved by SiRT?

A

20%

54
Q

a customer is planning to purchase a new array for a mixed mainframe and open systems environment. The existing infrastructure includes 2 Gb FC Switches for the Open Systems host. Which system can be configured to support this configuration?

A

VMAX 950F

55
Q

A PowerMax eNAS solution is being designed with VMAX Sizer. Which parameters need to be specified in the eNAS Properties tab when creating the eNAS instance?

A

(number of data movers, IO modules per data mover)

56
Q

What type of datasets are subject to inline compression for PowerMax?

A

FBA, CKD, eNAS

57
Q

What action is required on a PowerMax thin device before it can be deleted?

A

Remove from Storage Group

58
Q

An SRDF/S consistency group is created and enabled spanning two PowerMax arrays in a data center. What is used to prevent multiple hosts from writing to the R1 devices at the same time?

A

(host based software)

59
Q

What is a characteristic of a PowerMax Open Replicator control device?

A

cannot be involved in a TimeFinder session

60
Q

SRDF/A has been enabled between two PowerMax Arrays. Due to a loss of all RDF links, the SRDF/A session has been placed in a Transmit Idle state.

What happens to cycle switching and the delta sets?

A

Cycle switching stops; Transmit Delta Set count grows

61
Q

An administrator is managing historical performance data retention in Unisphere for PowerMax. Which unit of time is associated with the numerical value they specify for the retention period?

A

Days

62
Q

A storage architect is looking for best practices to expand an existing two-brick PowerMax 8000. They are planning to expand the PowerMax configuration to a four-block model for better performance.

What is a consideration?

A

cache size of the fourth brick can be either 1 or 2TB

63
Q

How many backups does each PowerMax SPS have, and what is the time duration to support cache during power failures in the data center?

A

two 10 minute backups

64
Q

In what format can loaded and mapped BCSD performance data be exported?

A

CSV

65
Q

What is used to collect host-based performance metrics on HP-UX for use with BCSD?

A

SAR

66
Q

an application workload is 20MB/s and the transmit delta set has 600MB of data from the previous cycle. The cycle time for the current cycle is 60 seconds.

How much data can be filled in the capture delta set in these 60 seconds?

A

(1200)

67
Q

What type of files are supported for import into sizer?

A

BTP, DCF,CSV and configuration files

68
Q

A script has been designed to create snapshot using the following command:

What is a consideration about the snapshot?

A

can be terminated only after 3 days and 23 hours

69
Q

What action is required before performing a restore operation from a TimeFinder SnapVX snapshot?

A

unmount the production volume

70
Q

Which part of the Virtual Storage Integrator provides communication to the storage?

A

SIS

71
Q

What is the default HTTPS port assignment for communication of VSI/IAPI requests sent to REST API of Unisphere for PowerMax?

A

8443

72
Q

A VMWare administrator has been tasked with managing storage for an ESXi cluster connected to a PowerMax array. The administrator is not familiar with Unisphere for PowerMax and wants to use the VMWare Web Client to provision RDM volumes to virtual machines.

Which Dell EMC product provides this functionality?

A

VSI

73
Q

An architect is meeting with a customer to discuss storage provisioning on PowerMax arrays.

What is a consideration for auto-provisioning groups on PowerMax arrays?

A

(an initiator can belong to one initiator group)

74
Q

A PowerMax customer has an existing Masking View for a large database environment. The parent Storage Group in this Masking View has three child Storage Groups with different Service Levels (SLs). The customer has been experiencing some database performance issues and wants to set the SL to Platinum for all the devices.

When the storage administrator attempts to set the SL on the parent Storage Group, they receive an error and the operation fails.

What is the cause of the error?

A

SLs cannot be set on parent Storage Groups

75
Q

In a legacy SRDF/A mode, the delta sets are numbered as follows:

Capture: N, Transmit: N-1, Receive: N-1, Apply: N-2

What is the number of the Transmit Delta Set after the second cycle switch?

A

N+1

76
Q

A storage administrator adds data to the VM on a remote ESXi server to resume production work from an R2 device. Which action needs to be taken before performing an SRDF failback and resuming production work from the R1 device?

A

Shut down the VM on the remote ESXi server

77
Q

Which parameters are required to calculate Virtual Provisioning Savings?

A

(Subscripted Total Capacity and Snapshot Capacity Total)

78
Q

A storage architect is designing a PowerMax solution. While discussing Unisphere server deployment options with a customer, the architect discovers that there are no available hardware resources for software installation.

Which type of management software deployment could be used?

A

eManagement

79
Q

Which type of notification is allowed when configuring Unisphere to send out notifications when an alert is triggered?

A

(SNMP)

80
Q

What is a requirement for single-host SRDF/Metro configurations?

A

multi-pathing softawre

81
Q

Which BCSD option(s) increases the amount of cache for SRDF/A replication?

A

. Cache Paging and Delta Set Extension Paging

82
Q

What is used for BCSD data collection in VMWare environments?

A

ESXTOP

83
Q

What will be the status of the links in a query after an SRDF suspend operation?

A

Suspended

84
Q

Which formats are supported for performance data exports in Unisphere for a PowerMax array?

A

XML CSV UPV

85
Q

Which migration options are supplied with PowerMaxOS and HYPERMAX OS at no cost?

A

NDM, Open Replicator, SRDF/DM

86
Q

an architect is helping a customer set up asynchronous replication for a new PowerMax array. The customer is looking to change the maximum SRDF/A cache usage and CPU allocation for different copy tasks.

Which Settings view in Unisphere for PowerMax user interface should be used to make these changes?

A

Management > Symmetrix Attributes

87
Q

SRDF/A has been enabled between two PowerMax arrays. An extended loss of all RDF links
occurs.
What is the state of the RDF pair after link connectivity is restored?

A

Partitioned

88
Q

Which role is required to rename a service level in Unisphere for PowerMax?

A

Administrator

89
Q

Data is being migrated from a VNX to a PowerMax using Open Replicator. The Pace Value is 0 with a Ceiling of 10%. Copies are taking a very long time to complete. What could be done to resolve this issue?

A

Leave Pace as is; set Ceiling to 100%

90
Q

Which Unisphere for PowerMax feature can a storage administrator use when provisioning new workloads on a PowerMax to maintain a certain Service Level?

A

Service Level Objective

91
Q

A storage architect is designing a PowerMax solution. The architect must ensure that the Unisphere server is not directly connected to the arrays. Which type of Unisphere for PowerMax deployment will achieve the design requirements?

A

Remote Configuration

92
Q

What happen’s to Jeff’s SELECT privelige?

A

Jeff’s SELECT privilege will be revoked

93
Q

What is the correct sequence of steps for modeling within BCSD?

A
  1. Define the project
  2. Run Modeling
  3. View charts, modeling properties, and risk reports
  4. Validate the project assets
  5. Map the performance data to the replication groups
94
Q

Which SRDF/A resiliency feature allows sessions to remain active during transient link outages?

A

Recovery After Link Loss

95
Q

What is the maximum number of front-end ports that can be configured on a PowerMax 8000?

A

2

96
Q

What is a characteristic of SRDF/Metro?

A

A dependent-write consistent copy is maintained between the R1 and R2 devices.

97
Q

A very small data center is being deployed at a service provider site. New 32 GB FC switches to support
Open Systems hosts have been purchased and installed in the data center. Two of the tenants for data
storage are from competing small businesses. Data storage for each tenant is expected to be a maximum
of 500 TB. Because tenants are from competing companies, the service provider wants to be able to
provide data storage from different arrays to each tenant to guarantee separation of data and information.
Which array is recommended to support these requirements, while occupying the least amount of space in
the new data center?

A

VMAX All Flash 950

98
Q

Which formula is used to calculate the Data Reduction Ratio?

A

Snapshot Total + (Subscribed Total / User Used)

99
Q

A storage architect is designing a PowerMax solution. The architect must ensure that the Unisphere server
is not directly connected to the arrays.
Which type of Unisphere for PowerMax deployment will achieve the design requirements?

A

remote configuration

100
Q

Which software layer feature can a storage administrator use when provisioning new workloads on a Powermax in order to maintain a certain Service Level?

A

Headroom Indicator

101
Q

A Storage architect is evaluating the performance of a PowerMax array during office hours. They want to know how much extra load the PowerMax can handle without significant performance degradation. The workload planner is used to identify the nightly hot spots during the backup window.
Between 11PM and 1AM and between 3AM and 5AM, backups are causing the PowerMax to exceed the best practice recommendation. The One-Time System Data Exclusion is used to filter out theres hot spots. After running this Workload Planning for some time they notice that the selection of windows they previously made are gone.
What is the explanation for this behavior?

A

One-Time System Data Exclusion only displays the last two weeks of performance data

102
Q

A Storage architect is evaluating the performance of a PowerMax array during office hours. They want to know how much extra load the PowerMax can handle without significant performance degradation. The workload planner is used to identify the nightly hot spots during the backup window.
Between 9:30PM and 1:30AM and between 3:15AM and 5:30AM, backups are causing the PowerMax to exceed the best practice recommendation. The recurring System Data Exclusion Periods chart is used to filter out these hot spots. After running this workload planning for a few weeks they notice that the selection records they previously made are showing different numbers than when they started viewing the report, some weeks ago.
What is the explanation for this behavior?

A

After a week the data of each time slot Is refreshed with new data

103
Q

When sizing a PowerMax solution, what does comfort zone analysis designate?

A

IOPS at which the disk can provide the most sustained response time

104
Q

During performance data collection for a PowerMax array, an administrator makes changes to the daemon_options files. Which daemon must be stopped and restarted for the changes to take effect?

A

storstpd

105
Q

What is the maximum number of files that can be uploaded in a single operation in Sizer?

A

10

106
Q

A storage architect is designing a PowerMax solution. The architect must plan for the external management software deployment to use the minimum required number of hosts.
Which type of Unisphere deployment would fulfill the design requirements?

A

local configuration

107
Q

A storage architect is demonstrating to a customer how they can use Unisphere to monitor the array efficiency. Which performance view can be used to achieve the task?

A

Dashboard

108
Q

A storage architect is demonstrating to a customer how they can register vCenter and ESXi servers, view all relevant storage related objects of an ESXi server, and troubleshoot storage performance.
Which system view in Unisphere can be used to do these things?

A

VMWare

109
Q

A storage architect is planning the security requirements for a Unisphere installation. They need to determine the default ports used for HTTPS and DB.
Which ports are required?

A

8443,3324

110
Q

A storage architect is planning a Unisphere upgrade. Which password is required for the upgrade?

A

lockbox

111
Q

A new customer is looking to see if their storage groups on the PowerMax array are meeting expectations on response time. Where in the Unisphere for PowerMax user interface would they go to check this?

A

Dashboard > SG Compliance

112
Q

T1 The SecurityAdmin for Unisphere wants to add a new user to perform all operations on a storage system, including security operations, and all StorageAdmin and Monitor operations.
What role needs to be assigned to new user?

A

Admin

113
Q

T2 SecurityAdmin for Unisphere wants to create a new user that will perform all management(active or control) operations on a storage system and be able to modify GNS group definitions in addition to all Monitor Operations. The user will not be able to create or delete user accounts.
What role needs to be assigned to the new user?

A

Storage Admin

114
Q

With Unisphere for PowerMax, what must be done to collect performance data?

A

Select array and register it for data collection

115
Q

Which thin provisioning component may be configured on the PowerMax and VMAX All Flash storage arrays?

A

Storage Group

116
Q

What collects and aggregates performance metrics in VMAX3 to determine data movements among a mixed configuration of drive technologies?

A

FAST

117
Q

Which device types can be managed with management software?

A

thin devices

118
Q

Which command can be used to automatically create a properly sized gatekeeper?

A

symconfigure

119
Q

Which purpose is served by Auto-Provisioning Groups?

A

device masking

120
Q

Which HBA flag cannot be set on an initiator?

A

Volume_Set_Addressing

121
Q

How do Copy mode linked targets and NoCopy mode linked targets behave when aSnapVX unlink operation disassociates the linked target?

A

Once the copy completes, Copy mode linked targets contain a full and usable copyof the source devices.

122
Q

What is the best practice sizing guideline for front-end FA utilization on a singleengine PowerMax array?

A

.8

123
Q

Which of the following is TRUE about a COMMIT statement executed at the end ofthe T1 unit of work?

A

It finishes the current T1 unit of work and a new one is initiated. All changes madeby UPDATE and DELETE commands during unit of work T1 are committed

124
Q

The Output file of a linux host collection utility does not match the BCSD parserformat. what could be the reason?

A

BCSD is incorrectly configured

125
Q

Which product allows for local protection for Z Systems?

A

TimeFinder SnapVX

126
Q

A storage administrator has mounted a snapshot of an existing datastore to theESXi server and decided to keep its existing signature.What action is prevented by keeping the existing signature?

A

restoring the datastore

127
Q

What needs to be created in BCSD to link multiple SRDF/A sessions?

A

consistency group

128
Q

What is the maximum number of Bricks and drives that can be configured in a VMAX 950?

A

8 Bricks and 1920 drives

129
Q

A storage administrator has mounted a snapshot of an existing datastore to the ESXi server and decided to keep its existing signature.

What action is prevented by keeping the existing signature?

A

Restoring the datastore

130
Q
A

Dell PowerMax and VMAX Family Solutions Design 2023 (34 decks)

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