system (see Physical Tab).
•
LDEV tab provides statistics about workload on disks (see LDEV Tab).•
Port-LUN tab provides statistics about traffic at ports and LU paths in the storage system (see Port-LUN Tab).•
WWN tab provides statistics about traffic at path between host bus adapters and ports (see WWN Tab).This section explains the contents of the tabs in the Performance Management tab and the contents of the Monitoring Options tab.
Physical Tab
When you click Go, Performance Manager and then Performance Management on the menu bar of the Storage Navigator main window,
Performance Monitor starts and the Performance Management window opens. The Performance Management window includes the Physical tab, where you can view usage rates for parity groups, volumes, channel processors, disk processors, etc. In addition, when you use Universal Volume Manager to map volumes in an external storage system (storage system other than USP V/VM) to the internal volumes, you can view usage conditions of volumes in the external storage system (i.e., external volumes) and the groups of external volumes.
For details on how to use this window, see Monitoring Resources in the Storage System.
Figure 4-1 Physical Tab of the Performance Management Window
When the Physical tab is active, the Performance Management window contains the following information:
Item Description
Monitoring
Switch Current monitoring status:
Enable: Performance Monitor is monitoring the storage system
Disable: The storage system is not being monitored.
Gathering
Interval Current interval of collecting statistics in short range monitoring.
For example, if the number of the CUs to be monitored is 64 or less, 1 min. is shown, and shortrange is selected as the storing period of statistics, the list and graph in the Physical tab show the statistics obtained every one minute.
When 65 or more CUs are monitored, the statistics update every 5, 10, or 15 minutes.
The gathering interval in long range monitoring is fixed to 15 minutes. If you select longrange as the storing period of statistics, the list and graph show the statistics obtained every 15 minutes regardless of the value of Gathering Interval.
For details on the storing period of statistics (short range and long range), see
Item Description
term within the selected range to narrow the statistics appearing in the list and graph on the Performance Management window. The differences in selecting
shortrange and longrange are described in Long-Range Storage and
Short-Range Storage.
Select the type of statistics to be displayed in the window. When the Physical tab is active, the list contains only one entry (i.e., Usage).
Monitoring
Term Select a monitoring term to narrow the range of usage statistics to view in the window. Starting and ending times for collecting statistics are displayed on both sides of the slide bar. Performance Monitor stores the monitoring data between these times, and you can specify the desired term within this range as the target of display in lists and graphs.
For example, if you want to view usage statistics within the range of 10:30 July 1 2006 to 22:30 July 31 2006, you set 2006/07/01 10:30 to the From box, set 2006/07/31 22:30 to the To box, and then click Apply.
To set a date and time in From and To, do either of the following: Move the slider to the left or to the right.
In the text box, select the number that you want to change. Next, click the upward or downward arrow button.
When you specify dates and time in From and To, Performance Monitor calculates the length of the specified period and displays the calculated length. The length of the period is in days when you select longrange, and is in minutes when you select shortrange.
From and To are unavailable if the monitoring data (that is, usage statistics) is not stored in the storage system.
The Real Time option is unavailable when the Physical tab is active.
List In the Monitoring Data area, the list on the upper right specifies the type of statistics to be displayed in the window. When the Physical tab is active, the list contains only one entry (i.e., Usage).
Item Description
Tree The tree lists items such as parity groups, channel adapters (CHAs), disk processors (DKPs), etc.
Parity Group or External Group icon:
a parity group or an external volume group
CHA folder icons (the channel adapter number and number of ports shown on the right side of the icon are examples):
an ESCON channel adapter a FICON channel adapter
a Fibre Channel adapter in Standard mode a Fibre Channel adapter in High Speed mode
a Fibre Channel adapter in Initiator/External MIX mode DKA folder icons:
a disk processor (DKP)
a data recovery and reconstruction processor (DRR) Access Path Usage icons:
an access path
No icon is available below the Cache folder.
The numbers on the right of icons ( ) below the Parity Group or External Group folder are IDs of parity groups or external volume groups. An ID beginning with E indicates that the group is an external volume group.
A volume existing in an external storage system and mapped to a volume in the USP V/VM storage system by using Universal Volume Manager is called an external volume. An external volume group is a quantity of external volumes grouped together for managing and that do not contain any parity information, unlike a parity group. However, Performance Management window treats external volume groups same as parity groups for convenience.
The parity group icon ( ) can represent a single parity group or two or more parity groups that are concatenated. If two or more parity groups are concatenated, volumes can be striped across two or more drives. Therefore, concatenated parity groups provide faster access (particularly, faster sequential access) to data.
For example, if the parity group icon ( ) indicates a single parity group 1-3, the text 1-3 appears on the right of the icon. If the parity group icon indicates two or more parity groups that are connected together, all the connected parity groups appear on the right of the icon. For example, if the parity group 1-3 is connected with the parity group 1-4, the text 1-3[1-4] appears on the right of the parity group icon. (All the parity groups connected with 1-3 are enclosed by square brackets).
Note: Storage Navigator does not allow you to connect two or more parity groups. If you want to use connected parity groups, contact the maintenance personnel.
Item Description
List The list shows statistics about parity group usage, processor usage, etc. The list shows statistics about up to a maximum of 4,096 resources at a time. If the number of resources exceeds 4,096, use Previous and Next to view the remaining resources. If you select connected parity groups in the tree, the list shows usage statistics for all the connected parity groups.
If you select the Array Control Processor (ACP) folder in the tree, the list shows a list of disk adapters (see Figure 4-3), so that you are able to confirm whether each disk adapter is located in Cluster-1 or Cluster-2. For example, if the Cluster-1
column displays 0 and the Cluster-2 column displays a hyphen, the disk adapter is located in Cluster-1.
When you click the parity group icon and the list displays the icon of
concatenated parity groups, the list shows only the ID of the parity group at the top of the concatenated parity groups.
For details on the list contents, see Monitoring Resources in the Storage System.
Page This area shows the page numbers in N/M format, where N indicates the number of the current page and M indicates total number of pages.
Use the following buttons to change pages of the list. Previous: Click to view the previous 4,096 resources. Next: Click to view the next 4,096 resources.
Volume
Migration Starts the Volume Migration if that program is enabled and for the display range. Use Volume Migration to optimize hard disk drive longrange is specified performance. For information on using Volume Migration, contact the Hitachi Data Systems Support Center (see Calling the Hitachi Data Systems Support Center).
Draw Presents a line graph illustrating changes in usage statistics. The graph can show up to eight lines simultaneously. Select an item in the list, then click Draw.
Line graph The line graph illustrates changes in usage statistics. The vertical axis indicates the usage rates (in percentage). The horizontal axis indicates dates and/or times. If you select connected parity groups in the tree, the graph displays changes in usage statistics for all the connected parity groups.
When you illustrate a graph of the following information with specifying
shortrange, you can select an item to be displayed in the graph from the list on the upper-right of the graph:
Information of external volume groups or external volumes.
Information of cache memory (write pending rates or usage statistics about cache memory).
In addition, when you display information of external volume groups or external volumes, you can select the highest value of the Y-axis (the vertical axis) of the graph at the Chart Y Axis Rate list on the upper left of the graph.
Figure 4-4 shows how to select an item displayed in the graph and how to select the highest value of the Y-axis.
If you select an item to be displayed from the list before clicking Draw, the graph shows the selected item. After drawing, if you select another item from the list, the graph will be updated without re-clicking Draw. Depending upon the values of the selected item, arrange the graph by changing the highest value of the Y-axis.
Figure 4-2 Storing Period of Statistics (Physical Tab)
Figure 4-3 List of Disk Adapters
Figure 4-4 Selecting an Item Displayed in the Graph and the Highest
Value of the Y-Axis (Physical Tab)