Monitoring Options Window
When you click Go, Auto LUN / Perf Ctl / Perf Mon and then Auto LUN on the menu bar of the Remote Web Console main window, Performance Monitor starts. When you click the Monitoring Options tab, the Monitoring Options window is displayed. Use it to make settings for obtaining usage rates about hard disk drives, channel processors, disk processors, and so on.
NOTE:
This note explains the following statistics to be displayed in tabs of the Auto LUN windows.
• The statistics for LUs that are displayed in the Port-LUN tab.
• The statistics for volumes that are displayed in the LDEV tab.
In the above tabs, performance statistics for 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, you must specify CUs to be monitored as follows:
• To display performance statistics for a LUSE volume in the Port-LUN tab, you must specify all volumes that make up the LUSE volume as the monitoring targets.
• To display performance statistics for a parity group to be displayed in the LDEV tab, you must specify all volumes that belong to the parity group as the monitoring target.
Figure 17 Monitoring Options Window of Performance Monitor
.
The Monitoring Switch area in the Monitoring Options window contains the following items:
Description Item
Select Enable to start obtaining statistics of the storage system (that is, monitoring). To stop monitoring, select Disable. The default setting is Disable.
Current Status
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 the number of CUs to be monitored is 64 or less, you can specify a 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 collects statistics (such as I/O rates and transfer rates) every one minute.
If the number of CUs to be monitored is 65 or more, the gathering interval can be specified to a value of 5, 10 or 15 minutes (in the 5-minute interval), and default is 5 minutes. For example, if you specify the gathering interval as 5 minutes, Performance Monitor gathers statistics (such as I/O rate and transfer rate) every 5 minutes.
This option is effective only for:
• Statistics displayed in the LDEV, Port-LUN, and WWN tabs
• Statistics displayed in the Physical tab with selecting shortrange for the storing period
When viewing the Physical tab with longrange selected for the storing period, the statistics collected every 15 minutes are displayed regardless of the value of the Gathering Interval.
Gathering Interval
If you click this button, all parity groups are listed in the PG list. If a large-sized configuration is being used, it may take long time to gather the PG list.
PG Selection Sup-port
Description Item
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 that belong to that parity group are displayed in the CU table on the right.
PG list
LDKC numbers. To select an LDKC as a monitoring target, click the LDKC number. All the CUs that belong to that LDKC are displayed.
LDKC list
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 displays 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 invert its color. To restore the cell to its original color, click the inverted cell. 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 inTable 6.
CU table
The number of existing and newly added CUs to be monitored.
Monitoring Target CUs
Adds the CU selected in the CU table to the CUs to be monitored. The characters in a cell appear as follows:
Removes the CU from monitoring targets. The characters in a cell appear as follows:
• Before Click N: in black S: in black
• After Click
–: Hyphen in black bold R: in blue italics Release
Applies settings in the Monitoring Options window to the storage system.
Apply
Resets the settings in the Monitoring Options window.
Reset
Table 6 Relationship between the Display of a Cell and the CU Status in the CU Table
Letter Displayed in The Cell CU Monitoring Status
CU Exists
S: in black CU is being monitored
Yes
Letter Displayed in The Cell CU Monitoring Status
CU Exists
None CU is not being monitored
N: in black CU will be monitored when it exists
No CU is to be released from monitoring –: Hyphen in black bold –: Hyphen in black CU will not be monitored when it exists
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 Auto LUN windows. When you specify one minute for the gathering interval like the example above, Performance Monitor can display the statistics for one day (that is, 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 (that is, 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 XP Continuous Access, TrueCopy for Mainframe, XP Continuous Access Journal, and Universal Replicator for Mainframe. 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 Monitoring Options window of Performance Monitor also change automatically.