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Which feature can be incorporated in the DMX4 to reduce the disk count and still satisfy the application’

A customer’s OLTP environment resides on a DMX2000 with 30 146 GB 15k drives to satisfy the IOPS requirement of the application. The customer is about to refresh the storage environment and deploy a DMX4.
Which feature can be incorporated in the DMX4 to reduce the disk count and still satisfy the application’s IOPS requirement?

What is the most likely design attribute that is responsible for this behavior?

A customer has a DMX3 with an application workload that is experiencing long response times with write operations during monthend batch processing. The customer has observed that other applications on the same DMX are experiencing long read response times during this same time period.
What is the most likely design attribute that is responsible for this behavior?

From a performance point of view, what is the minimum number of 2 Gb array ports that can handle both the work

A customer has four applications (A, B, C, and D) that run daily as follows:
Application A has its consistent peak workload of 25 K IOPS with an average 8 KB blocksize for 3 hours from 10 A.M.
Application B has its consistent peak workload of 25 K IOPS with an average 4 KB blocksize for 4 hours from Noon
Application C has its consistent peak workload of 45 K IOPS with an average 4 KB blocksize for 3 hours from 1 P.M.
Application D has its consistent peak workload of 15 K IOPS with an average 4 KB blocksize for 4 hours from 11 A.M.

From a performance point of view, what is the minimum number of 2 Gb array ports that can handle both the workload and 25% growth into a single array?

What is the likely reason for this performance issue?

During a proof of concept, a customer who is using a CLARiiON array with four Windows servers notices I/O performance problems on a specific server. Looking at Navisphere Analyzer data for the LUNs in question and comparing the statistics with the System Monitor (PerfMon) I/O counters for the same Windows physical disks, the I/O statistics in Navisphere Analyzer are significantly higher than the System Monitor shows.
What is the likely reason for this performance issue?