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Category: E20-324 (v.2)

Exam E20-324: VNX Solutions Design Exam for Technology Architects (update Octobe 24th, 2014)

Which ABQL value does the graph indicate?

Refer to the exhibit.

A customer has a performance problem and is using Unisphere Analyzer to investigate the issue.
They believe the problem is related to bursty data writes from the application. The Solutions
Architect (SA), who is at the customer’s location, is asked to explain how values are calculated
which could indicate this problem. The SA produces a graph, shown in the exhibit, to use in future
presentations to customers.
Which ABQL value does the graph indicate?

Which Average Queue Length value does the graph indicate?

Refer to the exhibit.

A customer has a performance problem and is using Unisphere Analyzer to investigate the issue.
They believe the problem is related to bursty data writes from the application. The Solutions
Architect (SA), who is at the customer’s location, is asked to explain how values are calculated
which could indicate this problem. The SA produces a graph, shown in the exhibit, to use in future
presentations to customers.
Which Average Queue Length value does the graph indicate?

What should the customer do?

A customer has a VNX array with ten 300 GB SAS disks installed in enclosure 0, bus 0. The
customer wants to reserve one disk as a spare and create a RAID 5 8+1 Pool with the remaining
hard drives.
The LUNs created from the pool will be used to store static data and will have very low I/O. When
the customer attempts to create the pool only five disks are available instead of nine.
What should the customer do?

How should the three tiers for the FAST VP pool be configured?

You have been tasked with designing the storage layout for a VNX7600 array. VMware hosts will
attach to the array using two HBAs and two Fibre Channel switches. The array will have FAST VP,
SnapView, and FAST Cache installed.
The customer wants to configure FAST Cache with a capacity of 2000 GB. They also want to put
as many drives as possible into a single FAST VP pool while still being able to use SnapView.
Snapshots will be taken each day of 10 x 1 TB LUNs and will be used for backups to tape. Once
the backups complete, the snapshots will be destroyed. The customer insists on using SnapView
due to the backward compatibility with their scripts. The source LUNs will produce less than 20%
change daily.
The array has the following hard drives installed:
— 31 X 200 GB Flash hard drives
— 34 X 600 GB 15K SAS hard drives
— 17 X 2 TB 7.2K NL-SAS hard drives
The entire design should follow EMC best practices.
Click on the calculator icon in the upper left corner.
How should the three tiers for the FAST VP pool be configured?

How should the LUNs for the reserve LUN pool be configured?

You have been tasked with designing the storage layout for a VNX7600 array. VMware hosts will
attach to the array using two HBAs and two Fibre Channel switches. The array will have FAST VP,
SnapView, and FAST Cache installed.
The customer wants to use as many Flash drives as possible for FAST Cache. They also want to
put as many drives as possible into a single FAST VP pool while still being able to use SnapView.
Snapshots will be taken each day of 10 x 1 TB LUNs and will be used for backups to tape. Once
the backups complete, the snapshots will be destroyed. The customer insists on using SnapView
due to the backward compatibility with their scripts. The source LUNs will produce less than 20%
change daily.
The array has the following hard drives installed.
— 31 X 200 GB Flash hard drives
— 38 X 600 GB 15K SAS hard drives
— 17 X 2 TB 7.2K NL-SAS hard drives
The entire design should follow EMC best practices.
How should the LUNs for the reserve LUN pool be configured?

How can this be achieved?

Click on the calculator icon in the upper left corner.
A customer wants to configure FAST Cache on their VNX storage system. Their working data set
is 600 GB in size. They plan to have sufficient FAST Cache to hold the working data set. There
are currently no Flash drives in the storage system. The customer wants to follow EMC best
practices.
How can this be achieved?

which spare drive would the array select first to replace the failed drive?

After reviewing the design for a new VNX5800, a customer requests an explanation of the sparing
algorithm used by the array. The following information is provided:
— A RAID group consists of eight 600 GB 10K SAS drives in a 6+2 RAID 6 configuration
— Within this RAID group there are three 125 GB LUNs
— One of the eight drives has just failed
Based upon this information, which spare drive would the array select first to replace the failed
drive?


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