E20-885 Online Practice Questions and Answers

A customer runs a CAD/CAM application on an EMC VNX for File. The application is accessed by users at multiple sites. The users report degraded response during peak access periods.

Performance monitoring of the file system shows a higher than expected disk queue length and a higher than expected number of unused blocks pre-fetched. What is the likely cause of the performance issue?

A. Multi-threaded sequential reads causing random access patterns

B. Single-threaded sequential reads flooding cache

C. Multi-threaded random reads degrading per-thread performance

D. Single-threaded random reads overutilize pre-fetching

A customer configured an EMC VNX to serve home directories to users. Users report intermittent timeouts accessing the home directories. While troubleshooting, you observe you can successfully connect to the file share, and can ping the VNX interfaces. What is the most likely cause of this performance issue?

A. Duplex mismatch

B. LACP speed mismatch

C. Incorrect subnet mask

D. Misconfigured authentication

A customer has an EMC VNX configured as an FTP server. They want to determine how many FTP connections are currently open. What server_stat statistic type could be used to determine this information?

A. fact

B. set

C. counter

D. element

You review a Unisphere Analyzer report from a customer's EMC VNX. You observe that disk read activity

is higher than can be accounted for from host reads and normal pre-fetch activity.

What is the likely cause?

A. Writes on the array are reasonably sequential, but there is not enough data in cache to fill each stripe.

B. Individual writes are being requested and sequenced until the entire stripe is cached and parity is calculated before being written.

C. Disk crossings and stripe crossings are normal events where large I/O is involved.

D. The Unisphere Analyzer report was run against the wrong storage processor.

A VNX customer has a production read-intensive Oracle environment that requires immediate access for end-user reporting. Which EMC replication application meets the customer's business requirement?

A. SnapView Snapshots

B. MirrorView/S

C. Replication Manager

D. MirrorView/A

You are implementing a VNX using AVM, and you cannot create any more dvols from their remaining classic LUNS to create a stripe volume.

What could be a reason for this?

A. LUNs must come from different RAID Groups.

B. LUNs must have different RAID configurations.

C. LUNs must not exceed 18 TB in size.

D. LUNs must come from the same RAID Group.

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. Use multiple network interfaces for the Data Mover interconnects

B. Use Unisphere QoS Manager to throttle bandwidth for Replicator

C. Set the TCP fast timer to 500 ms

D. Set the TCP slow timer to 200 ms

A System Administrator is configuring Data Mover interfaces. They want to keep the same IP addresses on both sites, but also want to reduce the risk of having duplicate IPs on the same network.

How can this be accomplished?

A. The non-production site interface must be manually configured to be off-line. During a failover, the interface must be manually configured to be on-line.

B. The non-production site interface must be manually configured to be off-line. During a failover, the interface will automatically go on-line.

C. There is no need for manual manipulation of the interfaces during a failover operation.

D. Interfaces on both sites can be up but DNS cache must be flushed during a failover.

During file system replication, which VDM information is replicated to ensure CIFS data will be user accessible?

A. Kerberos information

B. Global groups database

C. DNS information

D. Usermapper database

You implement a CIFS DR solution for a customer using the One-to-Many replication topology. They ask 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 should you advise the customer?

A. The original production site goes into cascade mode to synchronize data for the remaining DR sites.

B. The original production site remains a One-to-Many replication source for the other DR sites.

C. All remaining replication sessions to the other DR sites are suspended.

D. The DR site becomes a replication source for the other DR sites; the original production site is marked as invalid.