Question 1

A customer complains about high response times. This occurs frequently with bursts of write I/O at 6,000 IOPS for 10 second periods during each minute. The write response is 60 ms during these 10 second periods. The average IOPS rate reported by Hitachi Tuning Manager over 1 minute is 600. In this scenario, what is the average response time over 1 minute?

Accepted Answer

The average response time over 1 minute is calculated by considering the response time during the burst and the idle period. For 10 seconds, the response time is 60 ms at 6000 IOPS, and for the remaining 50 seconds, the response time is 0 ms at 0 IOPS. The average response time is (60 ms * 6000 IOPS * 10s) / (600 IOPS * 60s) = 10 ms.

Question 2

How does the HDLM Extended Round Robin algorithm impact sequential I/O?

Accepted Answer

The HDLM Extended Round Robin algorithm impacts sequential I/O by continuing to use the same path for a user-specified count of sequential I/O requests, which helps in maintaining the sequence and improving performance.

Question 3

For which two purposes is the SVP Performance Monitor suitable? (Choose two.)

Accepted Answer

The answer of For which two purposes is the SVP...

Question 4

Which two conditions will cause high Cache Write Pending on a VSP G8000? (Choose two.)

Accepted Answer

High Cache Write Pending on a VSP G8000 can be caused by over-utilized external storage or attempting to write to a RAID group at a rate beyond its ability.

Question 5

Which two conditions are amplified by the use of longer data intervals for analysts? (Choose two.)

Accepted Answer

Longer data intervals require more processing time and computing resources, and the peak values reported will reflect interactive user experience less accurately.

Question 6

A large bank is completing a capacity planning exercise and wants to upgrade their current VSP G1000 to properly support their online banking application for the next 18 months. The IT department wants to know where they should invest to achieve the transactional Service Level Objective (SLO). In this scenario, which three recommendations would you make? (Choose three.)

Accepted Answer

The answer of A large bank is completing a capacity...

Question 7

In a database environment, the system administrator complains that high write response times are triggering frequent automated alerts. However, utilization for processor, paths, and array groups is low. Database users are not complaining. What causing this problem?

Accepted Answer

Asynchronous destaging of writes occurs in bursts can cause high write response times without high utilization of processors, paths, or array groups, as the system may be handling writes in batches rather than continuously.

Question 8

A VSP G1000 performance analysis shows that server response times for virtualized volumes are high, 100 ms and higher, but HDD utilization rates in an external HUS 150 never exceed 35%. There are no processor or path constraints in the configuration. The workload is steady and stable. Which two actions will optimize this configuration? (Choose two.)

Accepted Answer

The answer of A VSP G1000 performance analysis shows that...

Question 9

A VSP G1000 customer is concerned about high VSD utilization alerts during their nightly backup and application maintenance window. To address their concerns, you want to inform them about the maximum acceptable utilization level range. What would be the range in this scenario?

Accepted Answer

The answer of A VSP G1000 customer is concerned about...

Question 10

You are recommending RAID 6 to a customer for a non-database HDT pool. What are two reasons for this recommendation? (Choose two.)

Accepted Answer

The answer of You are recommending RAID 6 to a...

Question 11

DP-Vol LUNs are taken from an HDP pool deployed with 128 disks (16x4D+4D RAID groups). Access is random read. Which combination of FC paths, LUN Queue Depth, and number of DP-Vols will result in a per-disk queue of 4 within this pool?

Accepted Answer

The answer of DP-Vol LUNs are taken from an HDP...

Question 12

For a VSP G1000 system serving a mission critical interactive workload, which two statements are true about VSD failover? (Choose two.)

Accepted Answer

The answer of For a VSP G1000 system serving a...

Question 13

A high level of writes to external storage is backing up into a VSP G1000 cache, creating a high write pending problem that is affecting other workloads. Which three actions will help to minimize this problem? (Choose three.)

Accepted Answer

The answer of A high level of writes to external...

Question 14

Which three statements are true regarding a VSP G400 configuration for a Microsoft Exchange Server environment? (Choose three.)

Accepted Answer

The answer of Which three statements are true regarding a...

Exam 1: Hitachi Vantara Certified Expert Performance architect