E20-880 Online Practice Questions and Answers

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.

A company has two data centers. They run multiple Exchange servers in each data center in a virtualized environment. The Exchange Admin would like the storage for each Exchange server to be configured to provide the most flexibility for migrating virtual machines between physical servers. VSS tools for application consistency compatibility needs to be maintained.

How should the storage for the Exchange virtual machine be allocated to the hypervisor?

A. Place the Exchange databases and logs on RDMs. Place the boot device for the VM on a VMFS volume.

B. Place the virtual machine files and exchange data files on a single VHD to allow maximum portability and failover.

C. Configure the DAG to save and restore its state when taken offline or moved.

D. Place the virtual machine files, database, and log each in a separate VMFS.

A VNX customer has several users on their CIFS share, which is also used for dedupe/compression. In addition, replication is in place with checkpoints on both ends to handle backup needs. Since dedup was activated a few days ago, all changed blocks that the dedupe process flags to eliminate from the primary FS get copied into the SavVol. Now, deduplication has been aborted. What could have caused this to happen?

A. The SavVol was extended

B. The SavVol extension protection mechanism was disabled

C. Older checkpoints were deleted

D. Checkpoints were deleted out of order

You are in a design session with a customer of an ESXi 5.0 cluster. One of the stakeholders inquires about vNUMA. By default, what is the minimum number of CPUs in a vNUMA enabled environment?

A. More than 4 vCPU

B. More than 8 vCPU

C. More than 12 vCPU

D. More than 16 vCPU

Your customer would like to replicate their Oracle database between their two data centers. The data centers are located approximately 1500 km apart. Which array-based solution is best suited to replicate their database?

A. MirrorView/A

B. MirrorView/S

C. SnapView

D. DataGuard

Refer to the exhibit,

You are proposing a storage solution using VNX to support a Microsoft Exchange 2010 virtual implementation on Microsoft Hyper-V. You have worked with the customer to understand the Exchange requirements, which are described in the exhibit. Based on availability, performance, and Exchange mailbox size requirements, you are recommending RAID 5 with 7.2K rpm NL/SAS disks.

Following EMC best practices, what is the minimum number of spindles required for this environment?

A. 14

B. 18

C. 27

D. 37

Refer to the exhibit.

You are proposing a storage solution using VNX to support a Microsoft Exchange 2010 virtual implementation on VMware ESXi. You have worked with the customer to understand the Exchange requirements, which are described in the exhibit. Based on availability, performance, and Exchange mailbox size requirements, you are recommending RAID 5 with 7.2K rpm NL/SAS drives.

Following EMC best practices, what is the minimum number of spindles that would be required for this environment?

A. 16

B. 26

C. 34

D. 48

Click the calculator icon in the upper left-hand corner.

A Snapshot Source LUN performs 650 random 16 kB IOPs, with a 4:1 R/W ratio.

At what rate is chunk data written into the RLP when the session starts?

A. 2.03 MB/s

B. 8.13 MB/s

C. 16.25 MB/s

D. 10.16 MB/s

Click the calculator icon in the upper left-hand corner. A clone source LUN is 2 TB in size. It performs 450 random 16 kB IOPs with a 2:1 R/W ratio. As part of ongoing testing, the clone is fractured for five minutes and then resynchronized. The testing is performed every hour.

How much data (to the nearest GB) is read from the source LUN as part of the resynchronization process?

A. 6 GB

B. 22 GB

C. 44 GB

D. 88 GB

A Customer is creating a new configuration which requires a ratio of 10% reads and 90% writes. The configuration will also need to handle very small I/O sizes. The customer is also concerned about the performance of the new drives. What RAID and drive configuration should be recommended?

A. RAID 1/0 with SAS Drives

B. RAID 5 with SAS Drives

C. RAID 6 with NL-SAS Drives

D. RAID 5 with NL-SAS Drives