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When you click Go, Performance Manager and then Performance Management on the menu bar of the Storage Navigator main window, Performance Monitor starts. When you click the Monitoring Options tab, the Monitoring Options window opens. Use it to make settings for obtaining usage rates about hard disk drives, channel processors, disk processors, etc.

Note: This note explains the following statistics to be displayed in tabs of Performance Management windows.

• The statistics of LUs that are displayed in the Port-LUN tab. • The statistics of volumes that are displayed in the LDEV tab.

In the above tabs, performance statistics of unused volumes are displayed as hyphens (-), if the range of monitored CUs does not match the range of CUs used in the disk storage system or registered as external volumes. In addition, depending on your storage system configuration, the list may display

performance statistics for some volumes and not display performance statistics for other volumes.

To correctly display performance statistics, specify CUs to be monitored as follows:

• To display performance statistics of a LUSE volume in the Port-LUN tab, specify all volumes that make up the LUSE volume as the monitoring targets.

• To display performance statistics of parity group to be displayed in the LDEV tab, specify all volumes that belong to the parity group as the monitoring target.

Figure 4-13 Monitoring Options Window of Performance Monitor

Item Description

Current Status Select Enable to start obtaining statistics from the storage system (that is, monitoring). To stop monitoring, select Disable. The default setting is Disable.

Gathering

Interval Specify the interval to obtain usage statistics about the storage system for short range monitoring. This option is activated when you specify Enable for Current Status. If CUs to be monitored are 64 or less, you can specify the value between 1 and 15 minutes by minutes, and the default setting is 1 minute. For example, if you specify 1 minute for the gathering interval, Performance Monitor collect statistics (such as I/O rates and transfer rates) every one minute.

If CUs to be monitored are 65 or more, the gathering interval can be specified to the value 5, 10 or 15 minutes (in the 5-minuted interval), and default is 5 minutes. For example, if you specify the gathering interval to 5 minutes,

Performance Monitor gathers statistics (such as I/O rate and transfer rate) every 5 minutes.

This option is effective only for:

ƒ Statistics displayed in the LDEV, Port-LUN, and WWN tabs

ƒ Statistics displayed in the Physical tab with selecting shortrange for the storing period

Item Description

PG button If you click this button on the header, all parity groups are listed in the PG list. If a large-sized configuration is being used, it may take a long time to gather the PG

list.

PG list A list of IDs of the parity groups that can be monitored. Each cell displayed in the list is accompanied by an icon . Click PG on the header to sort the parity groups by ID. If you click the cell for an individual parity group, the CUs belonging to that parity group are displayed in the CU table on the right.

LDKC list LDKC numbers. To select an LDKC as a monitoring target, click the LDKC number. All the CUs belonging to that LDKC are displayed.

CU table The CU table consists of cells representing CUs. One cell corresponds to one CU. Each row consists of 16 cells (CUs). A set of 16 rows represents CUs for one LDKC. The table header row shows the last digit of each CU number in the form of +n (n is an integer between 0 and 9, or a letter from A to F).

To select a CU, click a cell to highlight it. To deselect, click the cell to unhighlight it. To select all the (16) CUs of the same number in the second last digits, click the CU number (00 to F0). By dragging the cursor over multiple cells, you can select all the cells from the source to the destination.

The relationship of the display of a cell to the CU status is shown in Table 4-4).

Monitoring

Target CUs The number of existing and newly added CUs to be monitored.

Select Adds the CU selected in the CU table to the CUs to be monitored. The characters in a cell appear as follows:

Before Click After Click -: Hyphen in black N: in black italics

R: in blue italics S: in black

Release Removes the CU from monitoring targets. The characters in a cell appear as follows:

Before Click After Click

N: in black -: Hyphen in black bold S: in black R: in blue italics

Apply Applies settings in the Monitoring Options window to the storage system.

Reset Resets the settings in the Monitoring Options window.

Table 4-4 Relationship between the Display of a Cell and the CU Status

in the CU Table

CU Exists CU Monitoring Status Letter Displayed in The Cell

CU is being monitored S: in black CU is to be released from monitoring R: in blue italics Yes

CU is not being monitored None CU will be monitored when it exist N: in black

CU is to be released from monitoring -: Hyphen in black bold No

Performance Monitor has two kinds of periods (ranges) for collecting and storing statistics: short range and long range.

The storing period of statistics in short range is determined by the settings of

Gathering Interval option. Performance Monitor saves the statistics obtained up to 1440 times in SVP. Therefore, you can estimate the storing period of statistics with "gathering interval multiplied by 1440". For example, if you specify one minute for the gathering interval, the statistics for one day can be stored at the maximum from the following formula:

1 minute x 1440 = 1440 minutes = 24 hours = 1 day

This storing period is the range of display in the Performance Management windows. When you specify one minute for the gathering interval like the example above, Performance Monitor can display the statistics for one day (i.e., 24 hours) in the list and graph at the maximum. Also, when you specify 15 minutes for the gathering interval, Performance Monitor can display the statistics for 15 days in the list and graph at the maximum.

However, the value of the Gathering Interval option has nothing to do with the storing period of statistics in long range monitoring. The gathering interval in long range is fixed to 15 minutes. Therefore, when you select the

longrange storing period in the Physical tab of Performance Monitor, the display range in the window is always three months (i.e., 93 days). The monitoring switch settings in the Monitoring Options window work in conjunction with the monitoring switch settings in the Usage Monitor windows of TrueCopy, TrueCopy for IBM z/OS, Universal Replicator, and Universal Replicator for IBM z/OS. Therefore, if you use the Monitoring Options window to start or stop monitoring, or to change the gathering interval, the monitoring settings of these remote copy functions will also change. Conversely, if the settings in each Usage Monitor window are changed, the settings in the