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EMC E20-880 Dumps

EMC
VNX Solutions Expert for Technology Architects
EMC
VNX Solutions Expert for Technology Architects

Questions & Answers for EMC E20-880

Showing 1-15 of 240 Questions

Question #1 - Topic 1

If an SP fails within a VNX system, how many drives can the surviving SP address at the
same time if array ports 0 and 2 are used?

A. 4

B. 8

C. 15

D. 25

Question #2 - Topic 1

Seven users are trying to simultaneously read different parts of the same file from their
VNX for File storage system. All parts of the file are located on the same physical disk. I/O
from each of the users is sent sequentially to the array.
Which type of I/O workload is likely to be reported by the storage array?

A. Random I/O

B. Sequential I/O

C. Single-threaded I/O

D. Pre-fetched I/O

Question #3 - Topic 1

A customer implemented SAN Copy with default settings to create full copies of 60 DMX
array volumes on a VNX storage system. After several hours, they determine that the
process is taking much longer than expected.
Which setting change on the storage system will improve performance?

A. Disable the CMI channel on the destination storage system

B. Disable write cache for the Reserved LUN Pool on the source storage system

C. Add faster LUNs to the Reserved LUN Pool

D. Increase the throttle value

Question #4 - Topic 1

Exchange 2010 is being virtualized on a VNX storage array in a VMware environment.
Array-based replicas will be used to provide data protection.
Which best practice should be followed to increase performance and reduce the meta data
activity on the VMFS volume?

A. Enable Independent disk, Persistent mode.

B. Dynamically grow VMDK files as needed to save space and prevent fragmentation.

C. Deploy Lazy Zero disks to rapidly allocate space as needed.

D. Enable Independent disk, Nonpersistent mode.

Question #5 - Topic 1

A customer has deployed various applications on a VNX storage system.
During a performance analysis, you notice several hot spots on different drives and
enclosures. Upon further investigation you discover that all storage system ports are in use,
and that all ports are supporting the same number of enclosures and disk drives.
What will you recommend to your customer?

A. Balance application I/O

B. Physically balance port I/O

C. Logically balance port I/O

D. Balance switch I/O

Question #6 - Topic 1

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 if the
physical spindle is fully utilized?

A. Adjacent to each other in the middle

B. One at beginning and one at the end

C. Adjacent to each other at the beginning

D. Evenly placed, as non-adjacent as possible

Question #7 - Topic 1

A customer is implementing a VNX for File solution in a performance-oriented application
environment. There are Windows and Linux VM clients accessing the file systems. The
customer wants to track both file system and DataMover utilization. The Performance
Administrator prefers GUI to CLI access.
What would you recommend?

A. Unisphere Statistics for File

B. server_stats

C. Custom monitoring script

D. Unisphere Analyzer

Question #8 - Topic 1

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 IOPS they need to satisfy the needs of their transaction
logs.
You know the following:
✑ Transaction period: 8 hours (business day)
✑ Throughput during transaction period: 240 GB
How many IOPS will the transaction log volume require?

A. 273

B. 546

C. 1092

D. 1419

Question #9 - Topic 1

You have designed a VNX for File solution for a creative content provider. The solution
involves 10, 2 TiB file systems. Each file system has a Checkpoint taken every hour,
refreshed every day. The customer predicted a 2% daily change rate, and SavVol storage
was allocated based on that change rate.
Sometime after the implementation, the customer notices that some of the older
Checkpoints are disabled.
What is the most likely explanation?

A. Total SavVol utilization has exceeded the maximum allowed

B. Total number of Checkpoints has exceeded the maximum allowed

C. Checkpoints have a minimum refresh cycle of 48 hours

D. Write activity to the Checkpoint is highly random

Question #10 - Topic 1

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

Question #11 - Topic 1

A customer is concerned about the VNX Unified storage performance. The VNX provides
storage services for variety of Windows and UNIX application servers. When monitoring the
switches they notice heavy traffic between the servers and the storage.
The LUN analysis yields the following results:
$ /nas/sbin/naviseccli -h spa getdisk 1_0_4 -rds -wrts -bytrd -bytwrt
Bus 1 Enclosure 0 Disk 4
Read Requests: 478651
Write Requests: 202813
Kbytes Read: 47457840
Kbytes Written: 6449720
What is the I/O size being used to send data to disk?

A. 8 KB

B. 12 KB

C. 16 KB

D. 32 KB

Question #12 - Topic 1

You have designed an Auto-tiering solution using Flash, SAS, and NL-SAS disks in your
storage pool. Your design was implemented and scheduling has been running daily. The
customer reports that there is no data in the NL-SAS tier.
Why is this the case?

A. Data was previously moved to another tier

B. Scheduling is not required for this configuration

C. Tiering is set up for Lowest Available Tier

D. There was no data in the Flash drives to start with

Question #13 - Topic 1

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

Question #14 - Topic 1

A VNX for File administrator is implementing SnapSure for backup staging. The
administrator is concerned that this solution might affect the Production File Systems
(PFS). You are asked to describe the possible performance impact of SnapSure
checkpoints on the PFS.
How would you respond?

A. COFW will affect PFS write performance.

B. PFS read activity is not affected by Checkpoints.

C. COFW will affect PFS read performance.

D. Checkpoints have no performance impact on the PFS.

Question #15 - Topic 1

Exchange 2010 is being implemented on a pair of VNX storage arrays. There will be a
production site and a DR site, each with two servers and one VNX storage array. EMC
RecoverPoint will handle the remote replication between the sites.
Which is a valid architecture?

A. Implement both Exchange servers in a local DAG. Install EMC Replication Enabler for Exchange (REE) and install Replication Manager agents on all severs in the DAG.

B. Implement both Exchange servers in a cluster with shared disks. Use separate LUNs and RAID Groups for the Database, Log and Quorum. Install and enable EMC Replication Manager for remote replication.

C. Implement both Exchange servers in a local DAG. Install EMC Replication Manager for remote replication.

D. Implement both Exchange servers in a cluster with shared disks. Use separate LUNs and RAID Groups for the Database, Log and Quorum. Install and enable Microsoft Cluster Enabler for RecoverPoint to enable cluster failover between sites.

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