Monitoring the performance of user DASD groups
This topic describes the workspaces that report the performance of user DASD groups. This topic also describes the dialog boxes that you use to add, edit, delete, and migrate user DASD volume groups.
A user DASD group is a user-defined logical grouping of DASD volumes. Volumes within a user DASD group are typically related according to specific criteria. You can define a user DASD group based on volume name, device address, SMS storage group, or one or more DASD volume attributes (for example, Fragmentation Index and Response Time). After you define a user DASD group, you can use the User DASD Group Performance and User DASD Group Space workspaces to view aggregated performance and space metrics for the group as a whole. From these two workspaces, you can drill down to other workspaces that display performance and space metrics for each volume in the group.
You dynamically allocate user DASD volume groups. You access the user DASD workspaces through the User DASD Groups Performance node in the Tivoli® Enterprise Portal.
See Workspaces for general information on predefined workspaces and a list of all nodes that are included in the OMEGAMON for Storage on z/OS product. Each node corresponds to a specific area of storage resource monitoring. And each node includes links to a unique set of storage resource workspaces. See Accessing workspaces to learn about navigating among workspaces. And see Integration with other products to learn about linking to the workspaces of other IBM Tivoli Monitoring products.
In addition, with OMEGAMON for Storage on z/OS Version 4.2.0 Interim Feature 3 or later, you can issue volume-level Storage Toolkit commands from the User DASD Group report level. To access these commands, open the User DASD Groups Performance workspace from the Navigator, right-click a row on the table view and select the Volume Actions... menu item, then select the action you want to perform.
User DASD Groups Performance workspace
This topic describes the main components of the principal workspace for this node.
The following sections describe various components of this workspace.
- Views
- This workspace provides the following views. For a description
of the attributes used as column headings in the workspace table view,
review the attribute group definitions for this workspace in the online
help. The help resource includes attribute descriptions that are displayed
when you hover with the mouse pointer over a column heading.
- User DASD groups performance table view
- The table view contains one row of data for each defined user
DASD group. Each row includes the following list entries:
- The name of the group
- The number of SMS and non-SMS volumes
- The total number of volumes in the group
- The current highest response time for any volume in the group
- The current high busy percent for any volume in the group
- The device multi-processing level
- The low read and write hit percentages among all volumes in the group
- The highest DFW retry percentage in the group
- High volume response time > 25 bar graph
- This graph contains one bar for each user DASD group with a highest volume response time that exceeds 25 milliseconds. The height of the bar indicates the actual response time for that volume.
- Workspaces that are linked to this workspace
- See Navigating the workspaces of the User DASD Groups Performance node.
Learn how to navigate among workspaces here: Accessing workspaces. Also see Integration with other products.
See Workspaces for a list of all nodes provided in OMEGAMON for Storage on z/OS.
Summary information for the workspaces in this node
This section lists the views and related attribute groups for the workspaces of the User DASD Groups Performance node.
See Workspaces for general information on predefined workspaces and a list of all nodes that are included in the OMEGAMON for Storage on z/OS product. Each node corresponds to a specific area of storage resource monitoring. And each node includes links to a unique set of storage resource workspaces. See Accessing workspaces to learn about navigating among workspaces. And see Integration with other products to learn about linking to the workspaces of other IBM Tivoli Monitoring products.
See User DASD Groups Performance workspace for more information on the primary workspace for this node.
View | View type | Attribute group |
User DASD Groups Performance Report | TABLE | Volume Group Summary |
High Volume Response Time > 25 | BAR | Volume Group Summary |
View | View type | Attribute group |
Volume Performance Report | TABLE | DASD Volume Performance |
Volume Response Time > 25 | BAR | DASD Volume Performance |
View | View type | Attribute group |
Volume Cache Report | TABLE | Cache Devices |
Read Hit Percent < 55 | BAR | Cache Devices |
Write Hit Percent < 30 | BAR | Cache Devices |
View | View type | Attribute group |
User DASD Groups Performance Trend Report | TABLE | Volume Group Summary |
High Volume Response Time | BAR | Volume Group Summary |