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Code d'Examen: E20-816
Nom d'Examen: EMC (Symmetrix Solutions Expert Exam for Technology Architects)
Questions et réponses: 156 Q&As
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NO.1 The customer has a DMX-4 replicating to another DMX-4 (microcode level 5773 for both) over an
SRDF/S session between two sites 20 km apart and wants to understand the limitation (if any) of using
the Single Round Trip (SiRT) feature on RF directors. What is the applicable limitation of the setup?
A. SiRT only works for an I/O size of less than 32 KB.
B. SiRT is enabled for all block sizes.
C. SiRT would not work because the distance is greater than 12 km.
D. SiRT only works for SRDF/A.
Answer: A
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NO.2 Click the Calculator icon in the upper left-hand corner.
SRDF/S over Fibre Channel has been configured between two V-Max arrays that are 50 kilometers apart.
What is the expected write response time delay due to latency?
A. 0.25 ms
B. 0.5 ms
C. 1 ms
D. 2 ms
Answer: C
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NO.3 The customer wants a TimeFinder/Snap solution to create a point in time prior to modifying the source
data for testing purposes with a 16-hour RPO.
How should the Change Tracker data collection be set up to model the solution.?
A. Delta report with a reset of 8 hours
B. Delta report with a reset of 16 hours
C. Delta report with a reset of 4 hours
D. Sum report with a reset of 8 hours
Answer: B
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NO.4 What are the key differences between SIRT in 5772 and SIRT in Symmetrix V-Max with 5874?
A. SIRT in 5874 is enabled for all write sizes or if RTT > 115 microsec
B. SIRT in 5874 is enabled for write sizes up to 64 KB or RTT threshold > 520 microsec
C. SIRT in 5874 is enabled for all write sizes or if RTT < 115 microsec
D. SIRT in 5874 is enabled for write sizes up to 128 KB or if RTT < 115 microsec
Answer: A
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NO.5 A customer is planning to implement SRDF/S into their environment. The customer wants zero data
loss if they lose their primary data center (R1). The distance is 1,000 miles, and the customer would like to
maintain an application response time of 10 ms.
Which design would you implement?
A. SRDF/AR single-hop
B. SRDF/AR multi-hop
C. SRDF/DM
D. SRDF/S with adaptive copy initially
Answer: B
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NO.6 A customer has a single V-Max and you are helping to design a new SRDF solution. This customer
wants to replicate all its data with SRDF over a Gigabit Ethernet.
In order to get the maximum benefit from scaling, what is the most important consideration?
A. All GigE ports on the source should be able to see all GigE ports on the target array
B. Ports must have auto-negotiation off because we don't support Jumbo Frames
C. Speed limit value in the Symmetrix configuration file (not persistent)
D. Speed limits can be set on GigE ports from 100 to 10000 Mb (megabits)
Answer: A
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NO.7 An Open Replicator data migration from a HDS to Symmetrix array is being proposed. The customer
has the following requirements: Application downtime should be minimal and Open Replicator session
failure must not result in data loss
Which solution will meet the customer's requirements?
A. Cold pull with precopy
B. Cold pull with donor update
C. Hot pull with donor update
D. Hot pull with precopy
Answer: C
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NO.8 A customer is implementing a new SRDF/S environment with DMX arrays. The primary and secondary
data centers are 20 kilometers apart.
Which consideration is needed for planning, designing, and implementing a synchronous solution?
A. Ensure that the application can tolerate the additional latency
B. Ensure that adequate cache on the arrays is allocated
C. Ensure that the RAID configuration is identical on both arrays
D. Ensure that there is twice the recommended amount of bandwidth
Answer: A
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NO.9 A customer's application is stored on a DMX-4. The application runs 24x7x365. They would like to send
consistent replicas of this data simultaneously to four branch offices on a nightly basis. The branch offices
have CLARiiON arrays.
Which solution would you recommend?
A. Use TimeFinder/Mirror to create a consistent replica of the production application. Then use Open
Replicator cold push to replicate the data from the BCVs to the remote offices.
B. Use Open Replicator cold push to replicate the data to the remote offices.
C. Use Open Replicator hot push to replicate the data to the remote offices.
D. Use TimeFinder/Snap to create a consistent replica of the production application. Then use Open
Replicator cold push to replicate the data on the VDEVs to the remote offices.
Answer: A
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NO.10 The customer wants a TimeFinder/Snap solution to create a point in time prior to modifying the source
data for testing purposes. The snap would be kept for 8 hours. How should the Change Tracker data
collection be set up to model the solution?
A. Sum report with a reset of 4 hours
B. Delta report with a reset of 16 hours
C. Delta report with a reset of 4 hours
D. Delta report with a reset of 8 hours
Answer: D
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NO.11 A company has a Symmetrix V-Max array in an open systems environment. They want to use
TimeFinder/Snap to create a single copy per day of a production environment containing 200 volumes of
8 GB each. Twenty-five percent of the total I/O in the application is write activity.
What is the amount of physical storage required for all VDEVs?
A. 50 GB
B. 4 GB
C. 8 GB
D. 0 GB
Answer: D
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NO.12 A customer wants to migrate from DMX-3 with 5772 to DMX-4 with 5773 code. They are using
TimeFinder/Clone every night for backup processing with synchronous COFW. TimeFinder/Clone with
5773 allows them to use a new feature called asynchronous COFW.
How many back-end operations does TimeFinder/Clone make with Enginuity 5773 using Aynchronous
COFW compared with TimeFinder/Clone with Enginuity 5772?
A. Back-end operations are lower with 5773 Enginuity.
B. Back-end operations are the same in both Enginuity versions.
C. Back-end operations are higher with 5773 Enginuity.
D. Depends on disk speed and RAID protection.
Answer: B
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NO.13 A customer is migrating their Windows 2008 servers from HP storage to EMC V-Max storage.
Host-based performance metrics need to be used to design a configuration. EMC recommends the
diskperf -Y command to enable I/O statics in every server.
Why is enabling disk statistics collection recommended?
A. It improves performance of the servers
B. Otherwise, a reboot will be required to activate
C. Otherwise, you must start Performance Monitor
D. Because Windows 2008 leaves the default value to off
Answer: B
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NO.14 The customer wants to replace the three DMX 2000s with a single Symmetrix V-Max using Open
Replicator hot pull for the move. What sequence of steps should be taken to get ready for the copy
sessions?
LUN Masking of DMX 2000 remote volumes to the V-Max FA ports.
V-Max and DMX 2000 arrays are reachable via the same fabric or SAN extension.
FA ports of V-Max are zoned to FA ports of the three DMX 2000s.
V-Max and DMX 2000 arrays are reachable via point-to-point or FC-AL.
LUN Masking of the V-Max control volumes to the DMX 2000 FA ports.
All V-Max FAs have access to the DMX 2000 volumes being migrated.
A. 4,6,1,3
B. 4,3,5,6
C. 2,3,1,6
D. 2,3,5,6
Answer: C
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NO.15 A customer is running SRDF/A single session mode. They want to change into SRDF/S mode after
nightly periods of high write activity have completed. The switch to synchronous mode failed.
What is a potential cause for this failure?
A. SRDF/S cycle switching feature is not enabled.
B. Mode change feature is only supported with Concurrent SRDF.
C. SDRF/A write cache is not enabled at the remote site.
D. Fifty percent or more of SRDF/A write cache is in use on the target Symmetrix.
Answer: D
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