E20-880 Online Practice Questions and Answers

A customer is about to implement your VNX for File design for a file-sharing environment. The design specifies both NFS and Windows clients that access file systems in a multi-threaded manner. All file systems will be created using the Automatic Volume Manager. The customer is most concerned with disk efficiency, and wants to use all storage in each pool entry before creating another.

Which value would you change to meet this requirement?

A. is_greedy

B. slice

C. is_dynamic

D. stripesize

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

A VMware Administrator has received numerous reports from his users about performance degradation. The administrator believes that your storage design on the VNX is the reason for the symptoms.

You ask the administrator for an esxtop analysis of the affected ESXi server. When you examine the report and notice that the value on the Load Average Line is 2.00.

What would you report back to the administrator?

A. The ESXi server is overloaded. The VMs should be redistributed or physical CPUs added.

B. The VM load is 2% of the total ESXi capacity. There is a different reason for the condition.

C. Each VM is only 2% loaded of their individual capacity. They are not the cause of the condition.

D. The ESXi CPU multiplier is set to 2, allowing each VM to have four vCPUs configured. Further investigation is required.

You have designed a VNX for File implementation for a customer data environment that involves a high level of data duplication. The customer is concerned with disk efficiency, and you have designed the system with the minimum number of

disks necessary to meet expected storage needs after deduplication.

The customer is initially pleased with the implementation. The decision is made to add a cycle of SnapSure Checkpoints for backup and recovery purposes. Within weeks, deduplication automatically aborts.

What would you recommend to get deduplication working again?

A. Disable SnapSure auto-extension and manually manage SavVols

B. Decrease the auto-extension high watermark to 50%

C. Use more, smaller Checkpoints

D. Change the quota policy to file size

You are designing a VNX for Block solution for a customer. The application is a high throughput OLTP and will require the use of a volume manager to combine multiple LUNs across multiple SPs. Each of the component LUNs resides on a RAID 5 (4+1) RAID Group. Based on best practices, which volume manager stripe element size would you recommend?

A. 64 KB

B. 128 KB

C. 256 KB

D. 1024 KB

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

A customer has placed their user data, consisting of text, Word, and Excel files, on a thin LUN created from an existing pool. The thin LUN is reaching capacity and cannot be expanded over the pool due to capacity constraints on the pool. What is the best way for the customer to reclaim some of the capacity on the thin LUN?

A. Compress the thin LUN

B. Defragment the thin LUN

C. Migrate the data to a new LUN on a new pool

D. Delete old files

You are conducting an analysis of a Celerra system to migrate the data to a new VNX Unified storage system. You want to measure the current connections for the CIFS/NFS protocol. Which "server_stats" statistic type would you use to get the desired information?

A. Fact

B. Counter

C. Element

D. Correlated Set

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

Which Unisphere Analyzer metric would you compare with read cache hit/s to determine whether an application's read IO access pattern is random or sequential?

A. Read Throughput

B. Average Busy Queue Length

C. Response Time

D. Prefetch Bandwidth

What is a restriction for the High Bandwidth option for classic LUNs?

A. Only supported for RAID 5 4+1 .

B. Recommended for FLASH drives.

C. Limited to VNX File OE LUNs.

D. Only supported for RAID1/0 4+4.

A customer is creating a new configuration that has 100% sequential reads with very high thread counts. The configuration will be for a test bed which will require no high availability or fault tolerance on failures. What RAID and drive configuration should be recommended?

A. RAID 0 with SAS Drives

B. RAID 5 with NL-SAS Drives

C. RAID 6 with NL-SAS Drives

D. RAID 3 with NL-SAS Drives

Click the calculator icon in the upper left-hand corner. A customer is building out a VDI environment of 1000 light users and 50 heavy users. They plan to use Boot from SAN for all VDI users. They are preparing a complete HA environment. If boot requires 6300 I/Os, with 5700 write I/Os and 20 seconds to complete. How many I/Os will occur during an HA failover in this environment?

A. 315,000

B. 10,500

C. 105,000

D. 52,500

A customer implemented full SAN Copy with default settings in order to copy 60 DMX array volumes to a VNX storage system. After several hours, they determine that the process is taking much longer than expected. Which storage system configuration change 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

A VNX Administrator is analyzing storage workload distribution. The administrator is trying to determine if the array has an acceptable skew. Based on the workload in the illustration, what could be concluded?

A. 95% of the workload is distributed over 5% of the capacity, for a skew of 95%.

B. 10% of the workload is distributed over 90% of the capacity, for a skew of 80%.

C. 80% of the workload is distributed over 20% of the capacity, for a skew of 20%.

D. 90% of the workload is distributed over 50% of the capacity, for a skew of 10%.