EMC Symmetrix Solutions Expert Exam for Technology Architects : E20-816

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最新的 Technology Foundations E20-816 免費考試真題:

1. Which change in a Symmetrix VMAX workload will typically result in a decrease in the hit rate?

A) Increase in the percentage of sequential reads
B) Decrease in the I/O size
C) Decrease in the percentage of write I/Os
D) Spreading the workload over more devices

2. 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) 68 disks
C) 32 disks
D) 56 disks

3. Refer to the exhibit.

A composite group spanning two Symmetrix arrays is set up to run SRDF/Star using Cascaded SRDF as illustrated in the exhibit. Which condition must be met before an MSC cycle switch is performed at site B?

A) SDDF bitmaps have been swapped at Site A
B) Invalid track count between Sites A and C must be under 30000
C) Minimum cycle time must have elapsed
D) SYMCLI_STAR_ALLOW_CASCADED_CONFIGURATION option must be enabled in the options file

4. Click on the calculator icon in the upper left corner. Refer to the exhibit.

You are designing the Symmetrix VMAX architecture for a DAS-to-SAN SQL Server migration. Currently all user databases reside on a single locally attached disk enclosure, mounted to "M:\". You have decided on RAID-1 protected 15,000 RPM drives for the new SQL environment.
Last week, you configured Perfmon to record the current IOPS load of the databases during the 8-hour business day, Monday thru Friday as shown in the exhibit. During an average business day, the transaction log processes 43 GB worth of data.
Following EMC best practices, what is the minimum number of spindles that must be allocated for optimal transaction log performance?

A) 4
B) 10
C) 2
D) 6

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

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