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Exam Code: E20-880
Exam Name: EMC (VNX Solutions Expert Exam for Technology Architects)
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Total Q&A: 128 Questions and Answers
Last Update: 2013-12-25

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NO.1 A customer has created a thin LUN, enabled compression on a LUN Pool, and installed their Exchange
environment. The Exchange application is showing poor performance.
Which workload characteristic of Exchange would produce poor access times on a compressed LUN?
A. Small random writes
B. Small random reads
C. Sequential reads
D. Uncompressed or host based data
Answer: A

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NO.2 A customer has designed an environment using block based LUNs presented to individual hosts. They
have configured a pool to start using both thick and thin LUNs. One of the standalone servers is an
archive server running on Windows. They want to maximize capacity on the standalone server since the
data is no longer accessed. They have no more drives to increase LUN capacity.
How can the customer increase available capacity to the archive server?
A. Compress the data on the block based LUN
B. Add capacity to the existing LUN
C. Delete old files
D. Back up the files, reconfigure the LUN, and restore the data
Answer: A

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NO.3 A customer has a VNX system to provide storage for a VMware Cluster with five ESX hosts. Each ESX
host has one dual-port FC HBA connected to two FC switches. They are using VMware native failover
functionality for high availability and load-balancing.
The customer requires higher availability for the ESX host connectivity to the storage system.
What would you recommend to the customer?
A. Use dual HBAs with dual ports on each ESX host.
B. Use a host-based load balancing solution.
C. Use high quality stackable FC switches.
D. Current configuration ensures the best availability.
Answer: A

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NO.4 A customer would like to configure their VNX for File for the highest possible level of client availability.
There are five Ethernet ports on a single DataMover and a single Ethernet switch available for client
communications.
What availability features would you recommend to the customer?
A. Link Aggregation Control Protocol only
B. EtherChannel port aggregation and Fail Safe Networking
C. Fail Safe Networking and Link Aggregation Control Protocol
D. EtherChannel port aggregation only
Answer: A

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NO.5 A customer is in the design phase of their SQL server implementation. They request your guidance
concerning the number of disk drives needed to properly configure the database for performance. The
current utilization of the database is shown below:
-80% reads and 20% writes
-10K SAS disks
-RAID 5
-1150 IOPS
What is the minimum number of disk spindles required to service the random I/O requests during usage of
the SQL Server database?
A. 12
B. 14
C. 18
D. 20
Answer: B

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NO.6 You are working with a customer to design a VNX for Block solution for their SQL database. They
currently have a CX4-480. In the past they have co-located their database and log files. In the new VNX
design, the database will be placed in a FAST VP enabled pool. The transaction logs will be placed on a
traditional RAID Group. Your customer needs help determining the number of spindles they need to
satisfy the needs of their transaction logs.
You know the following: -Transactionperiod:8 hours (business day) -Throughput during transaction
period:240 GB
How many RAID 1/0 15K spindles will the transaction log volume require?
A. 4
B. 8
C. 10
D. 16
Answer: D

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NO.7 A customer is checking a NAR file in Unisphere Analyzer. They see that a RAID Group with only a single
LUN is shown with consistently large Disk - Average Seek Distances.
What could this indicate?
A. Randomness of the I/O
B. Write utilization
C. LUN misalignment
D. Applicationburstiness
Answer: A

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NO.8 Which action would be most effective in reducing the performance impact of a Snapshot on a Source
LUN?
A. Using faster disks for the Source LUN
B. Using faster disks for the Reserved LUN Pool
C. Increasing the Snapshot chunk size
D. Increasing the Snapshot write-aside size
Answer: A

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NO.9 A pair of VNX storage arrays is replicating between two data centers over an iSCSI connection. The
SQL Admin has noticed that a small OLTP database with a write size of 4k periodically experiences
increased disk response times. The Storage Admin reports that during the same period, replication
sessions are taking longer to complete. The Network Admin reports degraded performance between the
sites during the same period.
Why is the SQL application seeing increased disk response times from the local array?
A. Increased latency causes the MirrorView/A update cycles to take longer, increasing COFW activity.
B. The 64 KB chunk size for MirrorView/A does not match the small transaction size of the database,
increasing the bandwidth required between the arrays.
C. The MirrorView/A update cycle time is too short. It should be increased to improve write folding.
D. The MirrorView/A buffer size should be adjusted to match the smaller write I/O size.
Answer: A

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NO.10 Your customer is designing a Proof of Concept with SQL Server attached to a VNX. The storage
design includes seven LUNs on a RAID Group. The system is generally very heavily loaded, with a
particularly high load on the cache. This is a very carefully controlled environment and your customer has
asked for assistance in planning the layout of the LUN location on the physical spindles.
Where in the RAID Group would you recommend placing the two heavily used LUNs for a short-stroked
architecture?
A. Adjacent to each other at the beginning
B. One at beginning and one at the end
C. Adjacent to each other in the middle
D. Evenly placed, as non-adjacent as possible
Answer: A

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NO.11 Your customer has a new VNX solution configured with Flash, SAS, and NL-SAS drives. The customer
requires their OLTP, VDI, Software Development, and Regulatory Compliance workloads to be distributed
between the different drive types. Due to limited drive quantities only one workload type can be configured
using Flash drives.
According to best practices which configuration best assigns the workloads.?
A. VDI on Flash drives; OLTP on SAS; Software Development on SAS; Regulatory Compliance on
NL-SAS
B. OLTP on Flash drives; VDI on SAS; Regulatory Compliance on SAS; Software Development on
NL-SAS
C. OLTP on Flash drives; VDI on SAS; Software Development on SAS; Regulatory Compliance on
NL-SAS
D. VDI on Flash drives; OLTP on SAS; Regulatory Compliance on SAS; Software Development on
NL-SAS
Answer: A

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NO.12 As a result of suffering a catastrophic failure, your customer has requested a DR solution. The solution
must introduce a higher level of availability for their Exchange 2010 system. You have recommended a
strategy that involves Replication Manager with native DAG.
In what state(s) of the database would the replication occur?
A. Either active or passive
B. Active only
C. Passive only
D. Neither active nor passive
Answer: A

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NO.13 A company has added a large number of users to a VMware VDI deployment. The users are
complaining that the system (VNX-Block) is slow, especially when they start their shift. You have been
tasked to provide an economical solution.
Which technology would you use to improve performance?
A. FAST Cache
B. FAST VP
C. FAST
D. Fast VPN
Answer: A

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NO.14 You are migrating a backup application that runs on physical servers to a VDC. The VDC storage is
currently a VNX configured with NL-SAS drives only. Your customer is concerned about the cost to
achieve reasonable performance. You are designing the VMs that will support the application.
Based on cost, which would be the first solution you would recommend?
A. VMware Paravirtual SCSI virtual adapter
B. Virtual adapter is BusLogic Parallel
C. FAST VP Pool (Flash and SAS drives)
D. SAS RAID Group
Answer: A

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NO.15 A client has asked for assistance with designing his Exchange environment. The environment today is
fully virtualized and Exchange will be as well. The client is concerned about local recovery and has
decided to make VMware snapshots of their VMFS File system housing Exchange. The VMware servers
are all attached through fiber to a VNX.
What volume type is required to meet the customer's protection needs?
A. Virtual Mode RDMs
B. Physical Mode RDMs
C. VMFS
D. Dedicated RAID Group LUNs
Answer: A

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NO.16 A customer is in the design phase of their SQL server implementation. They request your guidance
concerning the number of disk drives needed to properly configure the database for performance. The
current utilization of the database is shown below:S
-85% reads and 15% writes
-10K SAS disks
-RAID 1/0
-1150 IOPS
What is the minimum number of disk spindles required to service the random I/O requests during usage of
the SQL Server database?
A. 8
B. 10
C. 12
D. 14
Answer: B

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NO.17 A VNX storage system is being configured to provide storage for an Exchange 2010 implementation for
2,000 users. Performance and reliability are more important than cost for the customer.
What RAID configuration should be used?
A. A RAID 1/0 Group, spread across two DAEs on two separate storage system busses
B. Two RAID 5 Groups in a striped metaLUN across two DAEs, one from each back end bus
C. A RAID 1/0 Group on a single DAE
D. A RAID 6 Group which can accommodate two simultaneous drive failures
Answer: A

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NO.18 A customer is about to implement your VNX for File design for a file-sharing environment. The design
specifies both NFS and Windows clients that access file systems in a multi-threaded manner. All file
systems will be created using the Automatic Volume Manager. The customer is most concerned with disk
efficiency, and wants to use all storage in each pool entry before creating another.
Which value would you change to meet this requirement?
A. is_greedy
B. slice
C. is_dynamic
D. stripesize
Answer: A

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NO.19 A customer would like to use five Ethernet ports on a VNX to increase the port and switch availability.
Two non-stackable Ethernet switches are available for the VNX and both support Full Duplex
communications.
How should the customer configure the VNX for the network?
A. Fail Safe Networking and Link Aggregation
B. Link Aggregation only
C. EtherChannel and Fail Safe Networking
D. EtherChannel only
Answer: A

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NO.20 A SQL Data Warehouse database is replicating between two VNX storage systems with Incremental
San Copy. The production database is on 15, 15k rpm SAS drives and the Reserved LUN Pool uses five
NL-SAS drives. The database is continuously updated locally and replicated once a day to maximize the
benefits of write folding. Replication takes place from 6 PM until 10 PM. At 6 PM the storage administrator
notices an increase in response time of the application, which steadily improves until 10 PM.
What should be done to improve performance during replication without affecting recovery data
granularity?
A. Put the Reserve LUN Pool on a similar disk and RAID type as the source volume.
B. Create a clone of the source volume and replicate the clone.
C. Expand the number of drives in the source volume to accommodate the increased I/O from the
replication session.
D. Adjust the San Copy throttle to minimize the impact to the production application.
Answer: A

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