# Monitoring logical control units

This topic describes the workspaces that monitor the status of logical control units. You access these workspaces through the Logical Control Unit 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 Tivoli OMEGAMON XE 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.

## Navigating the workspaces of the Logical Control Unit 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 Logical Control Unit 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. Logical Control Unit node: bulleted list showing the hierarchy of linked workspaces
Logical Control Unit LCU Volume Performance Dataset Performance Summary 1 Physical Volume Group Performance Dataset Performance Summary 1 Volume Performance Trend Dataset Performance Summary History Device Performance Details Cross System Volume Performance Dataset Performance Summary 1 Volume Performance Trend Dataset Historic Performance Summary Dataset Performance Historical Detail LCU Channel Detail LCU Volume Cache Dataset Performance Summary 1 Physical Volume Group Cache Dataset Performance Summary 1 Device Performance Details Cross System Volume Performance Dataset Performance Summary 1 Volume Cache Trend LCU DCM Channel Summary Logical Control Unit Trend LCU Volume Historical Performance Dataset Historic Performance Summary Dataset Performance Historical Detail LCU Historical Volume Cache Performance Dataset Historic Performance Summary Dataset Performance Historical Detail These workspaces display the volumes with the least favorable readings for the attribute within the logical control unit selected for navigation. Highest LCU Volumes Response Time (Top 10) 2 Highest LCU Volumes MPL (Top 10) 2 Highest LCU Volumes I/O Rate (Top 10) 2 Highest LCU Volumes Busy Percent (Top 10) 2 Lowest LCU Volumes Connect Percent (Top 10)2

Footnotes for Table 1:

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
2. 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
     - Dataset Performance Summary 1
   - Volume Performance Trend
     - Dataset Historic Performance Summary
       - Dataset Performance Historical Detail

## Logical Control Unit workspace

This topic describes the main components of the principal workspace for this node.

The direct situation analysis feature is available for this workspace. The feature can help you analyze and understand a problem that is displayed in this workspace. See Directly monitoring situations.

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.
  Logical control unit table view

    The table view displays one row of data for each logical control unit configured in the reporting LPAR. The view contains the following information:

    - The logical control unit number
    - The average delay queue
    - The contention rate
    - The director port busy percentage
    - The control unit busy percentage
    - The channel path I/O rate
    - The number of attached channels and whether there are DCM channels attached to the control unit
    - The high volume utilization rate
    - The high volume millisecond response time
    - The low read hit percentage
    - The low write hit percentage
    - The high DFW retry percentage
    - The number of SMS and non-SMS volumes
    - The total number of volumes
  Average delay queue bar graph
    This graph contains one bar for each logical control unit. The height of the bar indicates the average number of delayed requests on the control unit header.
  Average contention rate bar graph

    This graph contains one bar for each logical control unit. The height of the bar indicates the contention rate for the unit.

Workspaces that are linked to this workspace
  See Navigating the workspaces of the Logical Control Unit node.

  Learn how to navigate to workspaces here: Accessing workspaces. Also see Integration with other products.

  See Workspaces for a list of all nodes provided in Tivoli OMEGAMON XE 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 Logical Control Unit node.

See Workspaces for general information on predefined workspaces and a list of all nodes that are included in the Tivoli OMEGAMON XE 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 Logical Control Unit workspace for more information on the primary workspace for this node.

Logical Control Unit workspace
View | View type | Attribute group
Logical Control Unit Report | TABLE | Logical Control Unit
Average Delay Queue | BAR | Logical Control Unit
Average Contention Rate | BAR | Logical Control Unit

LCU Volume Performance workspace
View | View type | Attribute group
Volume Response Time > 25 | BAR | DASD Volume Performance
Volume Performance Report | TABLE | DASD Volume Performance

LCU Channel Detail workspace
View | View type | Attribute group
Control Unit Percent Busy | BAR | Logical Control Unit Channel Paths
Complex Channel Percent Busy | BAR | Logical Control Unit Channel Paths
Director Port Percent Busy | BAR | Logical Control Unit Channel Paths
Logical Control Unit Details | TABLE | Logical Control Unit Channel Paths

LCU 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

LCU DCM Channels Summary workspace
View | View type | Attribute group
DCM Configuration | BAR | Logical Control Unit
DCM Channels Percent Busy | BAR | Logical Control Unit
DCM Channels I/O per Second | BAR | Logical Control Unit

Logical Control Unit Trend workspace
View | View type | Attribute group
Logical Control Unit Trend Report | TABLE | Logical Control Unit
LCU Trend | PLOT | Logical Control Unit

LCU Volume Event Performance workspace
View | View type | Attribute group
Volume Performance Report | TABLE | DASD Volume Performance
Volume Response Time | BAR | DASD Volume Performance

LCU HyperPAV Details workspace
View | View type | Attribute group
HyperPAV Report | TABLE | LCU Control Unit
I/Os Queued - Alias Unavailable | BAR | LCU Control Unit
Percent I/Os Queued - Alias Unavailable | BAR | LCU Control Unit

LCU HyperPAV Details Trend workspace
View | View type | Attribute group
HyperPAV Report | TABLE | LCU Control Unit
Percent I/Os Queued - Alias Unavailable | PLOT | LCU Control Unit