E20-885 Online Practice Questions and Answers

A customer has a production CLARiiON replicating to a secondary CLARiiON at a remote site using MirrorView/S. The customer wants to upgrade to new EMC VNX, but due to cost constraints, they can only upgrade one of the CLARiiON arrays at this time.

How do you advise the customer?

A. A mirror relationship cannot exist between CLARiiON and VNX LUNs.

B. Replication between faster ports and slower ports is not supported.

C. Storage pool LUNs cannot mirror to RAID group LUNs.

D. VNX can only replicate to other VNX arrays.

You review a Perfmon log that contains several days worth of data for a customer's SQL Server database LUN. The log contains both read and write I/O per second collected at 3-minute intervals.

What method should you use to determine the correct I/O per second target number for calculating the number of RAID corrected spindles?

A. 75th percentile

B. Overall Peak

C. Overall Average

D. 90th percentile

Which part of the VNX initiates failover of a Blade?

A. SP

B. User

C. Blade

D. Control Station

A customer plans to migrate from an EMC CLARiiON to a new EMC VNX. They want to migrate some of the CLARiiON LUNs to thin LUNs on the VNX. Which SAN Copy configuration will allow them to avoid a fully provisioned thin LUN?

A. Push from thin LUN to thin LUN

B. Pull from thin LUN to thin LUN

C. Push from traditional LUN to thin LUN

D. Pull from traditional LUN to thin LUN

A customer has the following virtualized environment:

· One EMC VNX providing thin LUNs to a VMware ESX v4.0 host · Five VMs running critical OLTP systems supported by one or more databases.

The customer previously experienced some out-of-space conditions due to VMDK oversubscription. You recommend they upgrade their virtual environment to vSphere v5.0 to benefit from its VAAI features.

Which VAAI primitive addresses their issue?

A. Block Zeroing

B. Stun and Resume

C. Full Copy

D. Hardware Assisted Locking

A customer wants to expand FAST Cache on their VNX with MCx. They are concerned about performance impact until the new FAST Cache has been created.

What advice would you give the customer regarding the performance impact of changing the FAST Cache size?

A. Destroying the existing FAST Cache should be done during a period with low I/O activity, followed by the creation of the larger sized FAST Cache.

B. FAST Cache can be expanded non-disruptively without any performance impact.

C. Before adding extra drives to the existing FAST Cache, the Read Cache should be disabled and then re-enabled after the expansion has finished.

D. Before adding extra drives to the existing FAST Cache, the Write Cache should be disabled and then re-enabled after the expansion has finished.

A Storage Administrator would like to use MVM to create file systems for an application that requires exclusive access to the underlying drives. Another requirement is to distribute the load across as many drives as possible.

Which volume configuration is suitable for this type of application?

A. disk > stripe > meta

B. disk > meta

C. disk > stripe > slice > meta

D. disk > slice > stripe > meta

What is the maximum number of backend I/Os generated for every write to the PFS involved in a SnapSure checkpoint?

A. 3

B. 4

C. 5

D. 6

A customer is using VNX Replicator to replicate data from a single file system to a remote location. They are planning to replicate more file systems, but monitoring tools are showing bursts of data on the link instead of a smooth and constant flow of data. They also notice that latency on the link is higher than

expected.

What would you advise them to do to make more efficient use of the link?

A. Create and activate more Replicator sessions

B. Use QoS to guarantee 140 MB/s of bandwidth for Replicator

C. Set the TCP fast timer to 500 ms

D. Set the TCP slow timer to 200 ms

Your team is planning a DR test for a CIFS DR solution using VNX for File. You need to confirm that users will be able to access data at the DR site in the event of a source site disaster. The VNX at the source site will not be shut down during the DR test.

How should you proceed with the test?

A. Replication switchover from the source VNX

B. Replication switchover from the DR site VNX

C. Replication failover from the DR site VNX

D. Replication failover from the source VNX