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Chapter 6 Operation of Performance Optimization Function (GUI)
Area
Legend display area
Upon activation of Replacement Effect Prediction screen, the graph displays all ranges specified for target periods
on one screen. For changing graph scale, specify a range to be displayed on one screen (hours(3/6/12/24), days
(1 to 31), or weeks (1 to 4)) and then click the [Apply] button.
If system configuration is changed within a target period (including movement of logical disks), the graph lines
become discontinuous. The average/maximum Busy Ratios after a configuration change are calculated on the
basis of the system configuration after the changes. If configuration change is performed for two or more times,
the average/maximum Busy Ratios are displayed on the basis of configuration after the latest change. However,
the change occurs at the end of or after the target period, "***" is displayed for average/maximum Busy Ratios.
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If a RANK with Busy Ratio reaching a caution zone or an danger zone is detected, the logical disks on the RANK must
be moved to balance the I/O density. The tuning can be executed instantly or at a specified time and date by
registering a schedule.
Explanation will be made below about the procedures for logical disk movement.
(1) From deciding logical disks to be moved to starting disk moving/registering disk LD
movement schedule
(i) Selecting a RANK
Select a RANK to be tuned in the Configuration Display Area or in the detailed information display area.
You can specify a RANK in which the Busy Ratio has not reached the critical zone or attention zone yet as a
tuning target. It is possible to perform tuning for precautions or perform a tuning operation when short-term I/O
concentration has been detected by NEC Storage PerformanceMonitor.
Figure 6-20 shows an example of selecting a RANK to be tuned in the detailed information display area.
Table 6-17 Description of Replacement Effect Prediction screen (2/2)
Displays the items listed below:
Number
Indicates icon and number of RANK.
Average Busy Ratio [%]
Indicates an average Busy Ratio within the target period.
Maximum Busy Ratio [%]
Indicates a maximum Busy Ratio within the target period.
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Figure 6-20 Selecting a RANK to Be Tuned
Description
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RANK to be tuned
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