VNX Solutions Expert Exam for Implementation Engineers: E20-885 Exam
E20-885 Questions & Answers
Exam Code: E20-885
Exam Name: VNX Solutions Expert Exam for Implementation Engineers
Q & A: 169 Q&As
QUESTION 1
A customer wants to replicate a CIFS environment from a legacy EMC Celerra to a new EMC VNX.
Users are able to access CIFS shares from both arrays. The CIFS shares are on different
networks and replication is not running. The customer wants to make sure there will be no network
restrictions preventing replication between the data movers on two different networks. What TCP
ports should they ask the network team to open?
A. 8888, 8887, 5081
B. 80, 443, 8080
C. 5057, 445, 5087
D. 23, 25, 22
Answer: A
QUESTION 2
A customer recently upgraded from vSphere v4.x to vSphere v5.0 to benefit from new VMFS-5
features for their existing `DataStore1′ and `DataStore2′ datastores on an EMC VNX. A second
identically configured VNX was implemented and the customer created two additional datastores
on the new VNX. After monitoring the environment, the customer notices the VMs on `DataStore1′
and `DataStore2′ are not using the same sub-block structure as the two new datastores. What is
the reason for this behavior?
A. The old VMs are on an upgraded VMFS-5 datastore.
B. The old VMs are still running old VMware tools.
C. The new VMFS-5 features need to be licensed and activated.
D. The new VMFS-5 cannot support two VNX storage systems.
Answer: A
QUESTION 3
A storage administrator reports they are unable configure SAN Copy connections between two
VNX. The required cabling is in place and zoning is correct, but the SP connections still do not
appear in Unisphere Manager. What could have caused this issue?
A. SAN Copy is not installed on both VNX arrays.
B. SAN Copy is only licensed for local copies.
C. The SP ports are already being used by hosts.
D. Both VNX arrays are not in the same domain.
Answer: D
QUESTION 4
A Pool used for FAST VP has the following configuration:
Flash drives: 1,000 GB, with 1,000 GB free
SAS drives: 5,000 GB, with 2,500 GB free
NL-SAS drives: 20,000 GB, with 11,500 GB free
The tiering policy is set to Auto. An additional 600 GB of new data is written to the Pool. What is
the data distribution after the data is written?
A. Flash drives: 960 GB free SAS drives: 2,400 GB free NL-SAS drives: 11,040 GB free
B. Flash drives: 400 GB free SAS drives: 2,500 GB free NL-SAS drives: 11,500 GB free
C. Flash drives: 900 GB free SAS drives: 2,000 GB free NL-SAS drives: 11,500 GB free
D. Flash drives: 970 GB free SAS drives: 2,350 GB free NL-SAS drives: 11,080GB free
Answer: A
QUESTION 5
You are planning a CIFS DR solution for two existing EMC VNX. Each VNX has dual Control
Stations. Each VNX is also configured for a Recover Point protection solution on other VNX LUNs
that are non- file related. What recommendation would you give the customer concerning the CIFS
DR solution?
A. Configure IP aliasing on the Control Stations for both source and destination VNX systems before configuring
VNX Replicator
B. Configure IP aliasing on the Control Stations for both source and destination VNX systems after
configuring VNX Replicator
C. Configure IP aliasing on the source VNX system Control Stations before configuring VNX Replicator,
and then configure IP aliasing on the destination VNX system Control Stations after configuring VNX
Replicator.
D. Configure IP aliasing on the source VNX system Control Stations before configuring VNX Replicator
and use RecoverPoint to provide protection of the source VNX Control Stations to the destination VNX.
Answer: A
QUESTION 6
A customer recently purchased an EMC VNX to be connected to four ESXi 5.0 hosts via FC. Five
of the associated VMs (virtual machines) are running SQL Server 2008 R2. To avoid contention,
the customer wants the VM’s database and log drives on separate datastores. Which ESXi 5.0
feature would satisfy this requirement?
A. Network interface card teaming
B. Virtual Machine Anti-Affinity
C. Raw Device Mappings
D. VMDK Affinity
Answer: B
QUESTION 7
An administrator is attempting to vMotion a VM from one vSphere ESXi 5.0 host to another. The
ESXi servers are connected to three VNX arrays on the fabric. The vMotion fails. What is the most
likely reason?
A. RDMs are attached to the VM with different host LUN numbers on the ESXi servers.
B. There are active SnapView sessions on the VM preventing the vMotion.
C. RDMs are in physical compatibility mode and not eligible for vMotion.
D. There are active MirrorView sessions on the VM preventing the vMotion.
Answer: A
QUESTION 8
A customer requires an asynchronous DR solution for an NFS-only client environment. The
customer wants the solution to be simple to implement. It was recommended they create a single
NIS domain, and use several NIS servers to provide centralized authentication to the NFS clients
at both the source and destination sites. The customer asks you whether they should consider
using VDMs in this environment. What do you advise?
A. VDMs would offer no advantages to this environment.
B. VDMs allow VMWare integration of NFS service environments.
C. VDMs eliminate the need for Usermapper in NFS environments.
D. VDMs allow for assignment of specific CPUs to a NFS server.
Answer: A
QUESTION 9
A customer has an Oracle ASM database on an EMC VNX with FAST Suite enabled. They
observe intermittent performance degradation due to momentary data hot spots caused by bursty
transaction rates. What recommendation would you make to help alleviate these hot spots?
A. Enable Fast VP on the ASM LUNs
B. Modify the ASM rebalance power priority
C. Enable Fast Cache on the ASM LUNs
D. Disable ASM storage management
Answer: C
QUESTION 10
A customer has a Windows-only environment connected to an EMC VNX for File at their main
campus site. The customer plans to install a new EMC VNX at a remote branch office site. The
new VNX will be used to implement a DR solution for their main campus VNX using several
deduplicated file systems shared and available to clients via CIFS. Which solution do you
recommend to the customer?
A. Use VNX Replicator to replicate the VNX VDMs and associated file systems from the main campus
site to the VNX system at the branch office site to provide an asynchronous DR solution.
B. Use VNX Replicator to replicate the VNX VDMs and associated file systems from the main campus
site to the VNX system at the branch office site to provide a synchronous DR solution.
C. Use VNX SAN Copy to replicate the VNX block devices associated with the VNX file systems from
the main campus site to the VNX system at the branch office site to provide a synchronous DR solution.
D. Use VNX MirrorView/A to replicate the VNX block devices associated with the VNX file systems from
the main campus site to the VNX system at the branch office site to provide an asynchronous DR solution.
Answer: A
QUESTION 11
A system administrator wants to migrate medical-imaging data stored on an EMC VNX. The host
connects to the VNX via iSCSI. The IP SAN infrastructure has recently been updated to support 1
Gb/10 GB switching. The system administrator wants to maximize data transfer performance.
What would you recommend?
A. Implement 10 Gb/s iSCSI connection using a 9000 byte frame.
B. Use a 4 KB memory page size.
C. Implement 10 Gb/s iSCSI connection using a 2400 byte frame.
D. Increase the write-aside value.
Answer: A
QUESTION 12
A customer has a CIFS DR solution with EMC VNX using a One-to-Many replication topology. The
customer asks you to explain replication behavior under the following conditions:
Production site failover or switchover to a DR site
Replication start and reverse is performed
What would you advise the customer?
A. The original production site remains a One-to-Many replication source for the other remaining DR
sites.
B. All remaining replications sessions to the other DR sites are suspended.
C. The original production site goes into cascade mode to remain a replication source for the remaining
DR sites.
D. The DR site becomes the replication source for the remaining DR sites and the original production
site is marked as invalid.
Answer: C
QUESTION 13
A SQL database requires 1,000 I/O per second with 85% reads and 15% writes. If RAID 1/0 is
used, what is the total number of spindles required to generate the required I/O per second?
A. Ten 10K drives
B. Four 15K drives
C. One Flash drive
D. Fourteen 7.2K drives
Answer: A
QUESTION 14
A customer has two EMC VNX configured to replicate between sites. Each VNX has dual Control
Stations. The primary Control Station at the source site fails at 6 p.m. and reboots. At 8 p.m., the
customer completes DR testing and observes CIFS replication does not failover to the target site
VNX. Why does CIFS replication not failover to the target VNX during the DR test?
A. The control station of the primary VNX should have been failed back.
B. The control station of the second VNX should have been failed over.
C. The control station of the primary VNX should have IP bounding enabled.
D. The control station of the secondary VNX should have IP bounding enabled.
Answer: A
QUESTION 15
A customer has two identically configured Linux hosts (OS version, memory, CPU) attached to the
same network. One host is NFS-attached and the other is FC-attached to an EMC VNX. Both the
NFS file systems and the SAN LUNs are created from four RAID 5 (4+1) RAID groups. LUNs are
not shared between file and block. The customer reports NFS-attached host is able to achieve
much greater throughput via NFSv4 versus the FC-attached host. What is the source of the
performance difference between the file and block configurations?
A. FC encapsulation overhead
B. I/O size
C. Host Patch levels
D. NFS version
Answer: B
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