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EMC Symmetrix Solutions Expert Exam for Technology Architects Sample Questions:

1. A customer has the following storage configuration for a specific application:
-Symmetrix VMAX 4 engine with 128 GB cache per engine
-SRDF/A with two 1 Gbps links to remote site
-4.2 TB of logical volumes configured for SRDF/A replication
-SMC / SPA installed for storage management
The customer is periodically experiencing high response times for the application.
How can the customer use SPA to determine the potential cause of the high response times?

A) View Directors BE % busy versus Directors FE % busy
B) View SRDF/A device write pending count versus system write pending count
C) View Ports FE throughput in Kbps versus Devices Kbps read + Devices Kpbs written
D) View RDF-Group (group number) rewrites per sec

2. A new data warehouse will be hosted on an existing 4-engine VMAX array. The database server has 4 HBAs connected at 4Gb/s. Due to limited SAN switch ports only port 0 on each VMAX FA is connected - also at 4Gb/s.
The workload is expected to require at least 2300MB/s of reads at 128KB I/O size and must maintain performance in case of any major component failure in the host, switch or array. Assume that the existing workload on the VMAX does not exceed 100MB/s per port and assume that the ports can sustain up to 300MB/s without exceeding 70% utilization.
What is the minimum number of FA ports needed to spread the workload evenly across all 4 VMAX engines and meet the above performance requirements?

A) 24 FA ports, 3 per director
B) 16 FA ports, 4 per director
C) 16 FA ports, 4 per engine
D) 12 FA ports, 3 per engine

3. What is the device write pending limit of the total writeable cache for a Symmetrix VMAX ?

A) 12%
B) 8%
C) 10%
D) 5%

4. A new EMC customer recently installed their first VMAX and a complete suite of EMC management tools. Their lead capacity planner attended training and has started monitoring the VMAX. You receive a call and this person describes the measurements observed. During the period of heaviest workload, reported throughput on certain Fibre Channel ports is nearing 150,000 KB/second but those ports display only about 10% utilization. What is the likely cause?

A) I/O block size is very small
B) Sequential prefetch skews throughput %
C) I/O block size is very large
D) Striped metavolumes report invalid IOPS

5. Refer to the exhibit.

A customer requested that you conduct a performance evaluation test for migration of a DB2 database server to new Symmetrix VMAX storage. The test storage is configured as 20 logical volumes allocated on four FE ports to two HBAs in the server. Each volume is 50 GB and is configured as a 4 way striped meta. The results of the test indicate 20% less throughput than was expected.
The exhibit shows results from the data collected during the time frame of the test.
What is a likely cause for this performance issue?

A) FA processor limitation
B) Multipath configuration
C) Host workload allocation
D) Physical Disk limitation

Solutions: