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Chapter 1 Overview of Performance Monitoring Function
screen is not started. For details of environment setting, refer to 2.1.3 "Environment Setting".
The Display Refresh Rate determines the resolution of performance monitoring in the direction of time. Specify the
Display Refresh Rate in the number of updates per minute. Table 1-2 shows relation between Display Refresh Rate and
Display Refresh Interval.
Display refresh rate (times/minute)
Display refresh interval (second)
You cannot change the Display Refresh Rate while the Performance Monitoring screen is started. Change to the Display
Refresh Rate applies to all the disk arrays monitored by the server.
Increasing the Display Refresh Rate detects change in the performance information in a shorter interval but the number of
components simultaneously display is decreased. This is because the number of collection of performance information by
a single disk array unit in certain period is restricted not to obstruct file I/O from the application host in the overhead at
collection of performance information. This tendency is eminent especially when statistic information is being stored
simultaneously with real-time displaying.
1
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5
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2
2
1
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5
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1
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5
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2
Specifying a threshold as an index value of overload allows iSM to automatically detect occurrence of overload in a disk
array or a disk array component (occurrence of a load exceeding specified threshold value). Upon detecting an overload, a
message notifying overload is displayed. At the same time, asterisks (**) are displayed on the location of the Performance
Monitor screen. When occurrence of an overload is reported by a message, an administrator must identify location of the
overload on the Performance Monitor screen.
ARRAY1
NEC Storage Series
Table 1-2 Display Refresh Rate and Display Refresh Interval.
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Business Server
Overload
ARRAY2
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60
30
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Performance
Monitoring Screen
NEC Storage
PerformanceMonitor
LAN
I-10
3
4
5
20
15
12
ARRAY1
ARRAY2
Overload
Occurrence
Display
Operations
Administrator
6
10
**
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