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EMC Symmetrix Solutions Expert Exam for Technology Architects Sample Questions:

1. Click on the calculator icon in the upper left corner. A customer would like to add a new database application to their VMAX. This application is expected to produce 3000 I/O per second with 45% read hit and 25% write. The customer expects to use RAID 5 (3+1) on new drives that are not yet utilized. These drives perform 100 SCSI commands per second (read/writes) at 100% utilization.
Assuming drive utilization should not exceed 70%, how many physical drives, excluding hot spares, does the customer need to achieve performance requirements?

A) 48 disks
B) 56 disks
C) 32 disks
D) 68 disks

2. Which change in a Symmetrix VMAX workload will typically result in an increase in the read hit rate?

A) Increase in locality of reference
B) Increase in the I/O size
C) Spread the workload over more devices
D) Increase in the percentage of read I/Os

3. A new data warehouse will be hosted on an existing 4-engine VMAX array. The database server has 4 HBAs connected at 8Gb/s. Due to limited SAN switch ports only port 0 on each VMAX FA is connected - also at 8Gb/s.
The workload is expected to require at least 1700MB/s of reads @ 128KB I/O size. It 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 350MB/s per port. Also assume that the ports can sustain up to 500MB/s without exceeding 70% utilization.
What is the best practice HBA to FA mapping to ensure the required performance of the data warehouse?

A) HBA0 -> Engine 3 FA ports HBA1 -> Engine 4 FA ports HBA2 -> Engine 5 FA ports HBA3 -> Engine 6 FA ports
B) HBA0 -> FA 7e0, 8e0, 9e0, 10e0 HBA1-> FA 5e0, 6e0, 11e0, 12e0 HBA0 -> FA 7h0, 8h0, 9h0, 10h0 HBA1-> FA 5h0, 6h0, 11h0, 12h0
C) HBA0 -> E0 FA ports HBA1 -> F0 FA ports HBA2 -> G0 FA ports HBA3 -> H0 FA ports
D) HBA0 -> E1 FA ports HBA1 -> F1 FA ports HBA2 -> G1 FA ports HBA3 -> H1 FA ports

4. You are designing a Symmetrix VMAX array with 15K rpm Fibre Channel drives and 7.2K rpm SATA drives. How can you ensure that every back-end director manages just one type of drive?

A) Load drives of just one type in each disk array enclosure
B) Load drives of just one type in each bay
C) Connect drives of just one type to each engine
D) Connect drives of just one type to each front-end director

5. A customer plans to deploy Oracle on their new EMC VMAX. They are concerned about the performance of the redo log files. You recommend isolating these files to their own set of disks and deploying them on striped metavolumes. Why would you recommend striped metavolumes?

A) Spindle queue depth is increased
B) Random-read response is improved
C) The write-pending limit is higher
D) Actuator contention is reduced

Solutions: