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.

Note: User groups defined within the Configuration Tool are not visible in the OMEGAMON for Storage on z/OS product unless they have been migrated. See Migrating user DASD group definitions for more information on how to migrate user DASD groups.

Navigating the workspaces of the User DASD Groups Performance node

This section summarizes the workspace links that are available through the Navigator node. Depending on your monitoring goal, you follow a specific series of links to get detailed information about storage resources.

You start in the User DASD Groups Performance node to navigate to the workspaces that you see in Table 1. You can access the workspaces in this table using the standard path and method for navigating workspaces.

Table 1. User DASD Groups Performance node: list showing the hierarchy of linked workspaces
User DASD Groups Performance User DASD Group Volume Performance Dataset Performance Summary ¹ Physical Volume Group Performance Dataset Performance Summary ¹ Device Performance Details Cross System Volume Performance Volume Performance Trend Dataset Historic Performance Summary Dataset Performance Historical Detail User DASD Group Volume Cache Dataset Performance Summary ¹ Physical Volume Group Cache Dataset Performance Summary ¹ Device Performance Details Cross System Volume Performance Volume Cache Trend Cross System Group Summary Cross System Volume Performance User DASD Performance Trend User DASD Group Historic Volume Performance Dataset Historic Performance Summary Dataset Performance Historical Detail User DASD Group Historic Volume Cache Performance Dataset Historic Performance Summary Dataset Performance Historical Detail The following workspaces display the volumes that have the least favorable readings for the attribute within the user DASD group selected for navigation: Highest User DASD Group Volumes Response Time (Top 10) ² Highest User DASD Group Volumes MPL (Top 10) ² Highest User DASD Group Volumes I/O Rate (Top 10) ² Highest User DASD Group Volumes Busy Percent (Top 10) ² Highest User DASD Group Volumes Connect Percent (Top 10) ²

Footnotes for Table 1:

This group of workspaces is organized in the following nested pattern:
- Dataset Performance Summary
  - Dataset Performance Detail
    - Dataset Details
    - Dataset Performance Detail Trend
  - Dataset Details
  - Dataset Performance Summary Trend
    - Dataset Performance Historical Detail
This workspace links to the following set of related workspaces:
- Dataset Performance Summary (See the preceding note (¹) for details.)
- Physical Volume Group Performance
  - Dataset Performance Summary (See the preceding note (¹) for details.)
  - Volume Performance Trend
    - Dataset Performance Summary History
- Device Performance Details
- Cross System Volume Performance
- Volume Performance Trend
  - Dataset Historic Performance Summary
    - Dataset Performance Historical Detail

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 User DASD Groups Performance workspace for more information on the primary workspace for this node.

Table 2. User DASD Groups Performance workspace
View	View type	Attribute group
User DASD Groups Performance Report	TABLE	Volume Group Summary
High Volume Response Time > 25	BAR	Volume Group Summary

Table 3. User DASD Group Volume Performance workspace
View	View type	Attribute group
Volume Performance Report	TABLE	DASD Volume Performance
Volume Response Time > 25	BAR	DASD Volume Performance

Table 4. User DASD Group Volume Cache workspace
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

Table 5. User DASD Group Performance Trend workspace
View	View type	Attribute group
User DASD Groups Performance Trend Report	TABLE	Volume Group Summary
High Volume Response Time	BAR	Volume Group Summary