E20-880 Exam Questions

You are being asked to help a customer that is having issues with their new data warehouse application that they have just connected to their existing VNX. The administrator has cr...

Your customer is requesting a way to analyze .nar data without incurring any additional load on the SP during the analysis. What do you recommend?

Which Unisphere Analyzer metric is most useful when determining whether an application's read IO access pattern is random or sequential?

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?

When designing a VNX Block Pool layout for a high performance application, how should LUN ownership be assigned?

Why is it important for Pool LUNs to always have the same Default SP owner and Default Allocation owner?

How do you change the Allocation Owner of a FAST VP pool LUN to match the Default SP owner?

Click the calculator icon in the upper left-hand corner. Your customer has LUNs with a total size of 25,000 GB. The total I/O load is 10,000 IOPS, with a 4:1 R/W ratio. Analysis of...

A customer is trying to determine the correct configuration for an application they are planning to run on a VNX. The application consists of a heavy transactional workload with hi...

A customer is trying to determine the correct configuration for an application they are planning to run on a VNX. The application consists of a heavy sequential workload with high...

A customer has recently migrated an application from one VNX to another via EMCopy migration. The VNX's hardware is completely identical but they have been experiencing performance...

What is the best practice for configuring VNX OE File SavVol LUNs?

You received a call from a customer asking to help troubleshoot why they cannot select dvols using MVM from their remaining pool LUNS to create a stripe volume. What could be a rea...

A customer implemented your VNX for File design for a high-performance CAD/CAM application. The design specified several NFS clients, each accessing a single file system in a singl...

Your customer has an application on VNX File storage. The customer allocated the storage using Manual Volume Management in order to achieve the best performance. The customer noted...

You have a VNX customer who is concerned that you created multiple LUNs within the same Flash drive RAID group and believes this will create disk contention with reduced performanc...

You are migrating a database on NFS to a new VNX. The customer notes that you have designated only SAS drives for the database transaction logs and not any Flash drives. The custom...

You received a call from a customer asking to help troubleshoot why AVM cannot select dvols from their remaining classic LUNS to create a stripe volume. What could be a reason for...

You received a call from a customer asking to help troubleshoot why AVM cannot select dVols from their remaining classic LUNS to create a stripe volume. What could be a reason for...

In VNX with MCx, if the Block compression rate is set to high, what is the initial compression bandwidth?

A customer created a Thin LUN, enabled compression on a Pool, and installed their email application environment. The application is showing poor performance. Which workload charact...

A customer needs to reclaim space and has decided to enable compression on a Thick LUN in their environment. What happens to the LUN when it becomes compressed?

During decompression with default settings, if the pool becomes too full, decompression will be paused but host I/O can continue. At what percent full will host I/O be terminated t...

Considering LUN compression in a VNX, how has initial compression performance changed in VNX with MCx?

A customer designed an environment using VNX LUNs presented to individual hosts. They configured a Pool to start using both Thick and Thin LUNs. One of the standalone servers is an...

A customer is considering purchasing a new VNX with MCx. They have a performance sensitive application and would like to use the Thin LUN to maximize pool capacity. What would you...

A customer is considering purchasing a new VNX with MCx. Performance of the application is the top priority. What would you recommend the customer consider before proceeding with t...

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

A customer creates a multi-tiered pool with the following configuration: - Five 200 GB FAST VP optimized Flash drives configured as 4+1 RAID 5 - Ten 600 GB 15 krpm SAS drives confi...

A customer creates a multi-tiered pool with the following configuration: - Five 200 GB FAST VP optimized Flash drives configured as 4+1 RAID 5 - Five 600 GB 15 krpm SAS drives conf...

A customer has an application that uses a dataset of 15 TB. The skew for the application is 97%. The application requires storage capable of performing 10,000 IOPs. The application...

A customer has an application that uses a dataset of 20 TB. The skew for the application is 97%. The application requires storage capable of performing 13,000 IOPs. The application...

A Customer is considering purchasing a new VNX but can't decide whether to go with Classic RAID groups or pools. They would like to know the performance differences between the two...

Which is an EMC Best Practice when configuring the High Bandwidth option for Pool LUNs?

A customer asks about the High Bandwidth option for a data warehousing application. The customer would like to know the benefits of implementing this feature. How do you respond?

A customer recently added a large number of new users to their VNX for Block storage system. They now notice that the system is slow. You have been asked to fix this problem. Their...

A VNX customer is using storage pools and FAST Cache to support a mixed workload environment. The mission-critical application is SAP with an underlying MS SQL database. The SQL da...

Click the calculator icon in the upper left-hand corner. Your customer wants to use a SnapView Snapshot of a Pool LUN as part of their backup strategy. You need to determine whethe...

A customer has requested to have Access Logix disabled on a VNX array. How would you accomplish this?

Which LAN configuration is recommended for an iSCSI network on the VNX?

Click the calculator icon in the upper left-hand corner. A clone source LUN is 512 GB in size. It performs 1500 random 4 kB IOPs with a 3:1 R/W ratio. As part of ongoing testing, t...

What is the best practice for where SavVol should be located?

Where does SnapSure place the SavVOL, by default?

What is a performance concern when the last VNXsnapshot for a Thick LUN is deleted?

Your customer is experiencing performance degradation when deleting VNX Snapshots. What technique would you recommend to avoid the defragmentation process that is occurring?

A customer has configured replication between Data Movers on two VNX arrays. In order to provide maximum network performance for the replication process, the customer has configure...

What is the main reason MirrorView/S has a lower effect on CPU utilization compared to MirrorView/A?

Click the calculator icon in the upper left-hand corner. An application generates 800 random 16 kB IOPS with a R/W ratio of 3:1. An MV/A mirror is started on the application LUN. T...

Click the calculator icon in the upper left-hand corner. An application generates 500 random 8 kB IOPS with a R/W ratio of 3:1. An asynchronous mirror is started on the application...

When using VNX Replicator for File why is it important to configure the SavVol on different drives from the PFS whenever possible?