# Monitoring cache CU performance

This topic describes the workspaces that monitor the status of the performance of cache CU. You access these workspaces through the Cache CU 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 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 Cache CU 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 Cache CU 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. Cache CU Performance node: bulleted list showing the hierarchy of linked workspaces
Cache CU Performance Cache CU Volume Cache Dataset Performance Summary 1 Physical Volume Group Cache Dataset Performance Summary 1 Device Performance Details Cross System Volume Performance Volume Cache Trend
Cache CU 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 Volume Performance Trend Dataset Historic Performance Summary Dataset Performance Historical Detail Symmetrix Configuration. Note: Obtaining EMC Symmetric data can only be done in conjunction with the applicable EMC hardware and software. The hardware required is an EMC Symmetrix at the appropriate microcode level. Also required are the EMC Symmetrix Control Facility runtime libraries available from EMC. Cache CU Raid Rank Physical Volume Group Cache Dataset Performance Summary 1 Cache CU Raid Rank Trend Cache CU Performance Trend Cache CU Volume Historical Performance Dataset Performance Summary History Dataset History Performance Detail CCU Volume Cache History Dataset Historic Performance Summary Dataset Performance Historical Detail Cache CU Raid Rank Historical Data
TotalStorage Configuration TotalStorage Ranks TotalStorage Array Configuration TotalStorage Ranks Trend TotalStorage Extent Pool Volumes TotalStorage Volume Trend TotalStorage Extent Pool Trend TotalStorage Rank History TotalStorage Volume History TotalStorage CU Volumes TotalStorage Volume Trend The following workspaces display the volumes that have the least favorable readings for the attribute within the SSID selected for navigation: Lowest Volumes CU Read Hit Percent (Top 10) 2 Lowest Volumes CU Write Hit Percent (Top 10) 2 Lowest Volumes DFW Hit Percent (Top 10) 2 Highest Volumes Destaging Rate (Top 10) 2 Highest Volumes CU Staging Rate (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
   - Volume Cache Trend
     - Dataset Historic Performance Summary
       - Dataset Performance Historical Detail

Access the following linked workspaces by selecting the Cache CU Performance node in the Navigator. Right-click the node. Select the workspace that you want to access in the pop-up menu.
  These workspaces list the volumes with the least favorable readings for the attribute across the z/OS image.
  - Lowest Volume Read Hit Percent
  - Lowest Volume Write Hit Percent
  - Lowest Volume DFW Hit Percent
  - Highest Volume Destaging Rate
  - Highest Volume Staging Rate

## Cache CU Performance 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
  The 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. For information about related workspaces, see Summary information for the workspaces in this node.
  Cache performance table view
    The table view displays one row of data for each cache control unit configured to the reporting LPAR. The view contains the following information:
    - The subsystem ID of the control unit
    - The control unit type
    - The read and write hit percentages for the control unit
    - The read I/O percent
    - The bypass and inhibit percents
    - The DASD Fast Write hit and retry percents
    - The Cache Fast Write read and write percents
    - The track destaging rate
    - The track staging rate
    - Storage facility series
  Read Hit Percent bar graph
    This graph contains a bar for each cache control unit that had a read hit percent greater than zero. The height of the bar indicates the read hit percentage.
  Write Hit Percent bar graph
    This graph contains a bar for each cache control unit that had a write hit percent greater than zero. The height of the bar indicates the write hit percentage.
  DFW Hit Percent bar graph
    This graph contains a bar for each cache control unit with a DASD Fast Write hit percent greater than zero. The height of the bar indicates the DASD Fast Write hit percentage.
  DFW Retry Percent bar graph
    This graph contains a bar for each cache control unit with a DASD Fast Write retry percent greater than zero. The height of the bar indicates the DASD Fast Write retry percentage.
  Track Destaging Rate bar graph
    This graph contains a bar for each cache control unit with a track destaging rate greater than zero. The height of the bar indicates the track destaging rate.
Workspaces that are linked to this workspace
  See Navigating the workspaces of the Cache CU Performance 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 Cache CU Performance 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 Cache CU Performance workspace for more information on the primary workspace for this node.

Cache CU Performance workspace
View | View type | Attribute group
Cache Control Unit Performance Report | TABLE | Cache Control Unit
DFW Hit Percent | BAR | Cache Control Unit
DFW Retry Percent | BAR | Cache Control Unit
Track Destaging Rate | BAR | Cache Control Unit
Read Hit Percent | BAR | Cache Control Unit
Write Hit Percent | BAR | Cache Control Unit

Cache CU Volume Cache workspace
View | View type | Attribute group
Read Hit Percent < 55 | BAR | Cache Devices
Write Hit Percent < 30 | BAR | Cache Devices
Volume Cache Report | TABLE | Cache Devices

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

Cache CU Raid Rank workspace
View | View type | Attribute group
Raid Rank Report | TABLE | Cache Raid Rank
Read Response Time | BAR | Cache Raid Rank
Write Response Time | BAR | Cache Raid Rank

Symmetrix Configuration workspace
View | View type | Attribute group
Subsystem IDs | TABLE | Symmetrix SSIDs
Symmetrix Configuration Report | TABLE | Symmetrix Configuration
Symmetrix Directors Report | TABLE | Symmetrix Directors

Symmetrix Disk Director Summary workspace
View | View type | Attribute group
Logical Volumes Per Disk | BAR | Symmetrix Director Summary
Cache Efficiency | BAR | Symmetrix Directors

Symmetrix Devices workspace
View | View type | Attribute group
Devices with Mirrors in Error | TABLE | Symmetrix Devices
Symmetrix Devices | TABLE | Symmetrix Devices

Cache CU Performance Trend workspace
View | View type | Attribute group
Cache CU Performance | PLOT | Cache Control Unit
Cache Control Unit Performance Trend | TABLE | Cache Control Unit

Volume Cache Trend workspace
View | View type | Attribute group
Volume Cache Trend | TABLE | Cache Devices
Cache Hit Percent | PLOT | Cache Devices

Volume Cache History 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

Cache CU Historic Raid Rank workspace
View | View type | Attribute group
Raid Rank Report | TABLE | Cache Raid Rank
Read Response Time | BAR | Cache Raid Rank
Write Response Time | BAR | Cache Raid Rank

Cache CU Raid Rank Trend workspace
View | View type | Attribute group
Raid Rank Report | TABLE | Cache Raid Rank
Response Time | PLOT | Cache Raid Rank

TotalStorage® Ranks workspace
View | View type | Attribute group
TotalStorage Ranks | TABLE | TotalStorageDS Rank
Operations Per Second | BAR | TotalStorageDS Rank
Average Response Time | BAR | TotalStorageDS Rank

TotalStorage Array Configuration workspace
View | View type | Attribute group
DDM Capacity | BAR | TotalStorageDS Array
TotalStorage Arrays | TABLE | TotalStorageDS Array
DDM Speed | BAR | TotalStorageDS Array

TotalStorage CU Volumes workspace
View | View type | Attribute group
TotalStorage CU Volumes | TABLE | Cache Devices
Physical I/O Rate | BAR | Cache Devices
Physical Response Time | BAR | Cache Devices

TotalStorage Extent Pool Volumes workspace
View | View type | Attribute group
TotalStorage Extent Pool Volumes | TABLE | Cache Devices
Physical I/O Rate | BAR | Cache Devices
Average Physical Response Time | BAR | Cache Devices

TotalStorage Extent Pool Trend workspace
View | View type | Attribute group
TotalStorage Extent Pool Trend | TABLE | TotalStorageDS Extent Pool
Response Time | PLOT | TotalStorageDS Extent Pool

TotalStorage Ranks Trend workspace
View | View type | Attribute group
TotalStorage Ranks Trend | TABLE | TotalStorageDS Rank
Average Response Time | PLOT | TotalStorageDS Rank

TotalStorage Volume Trend workspace
View | View type | Attribute group
TotalStorage Volume Trend | TABLE | Cache Devices
Physical Response Time | PLOT | Cache Devices

TotalStorage Rank History workspace
View | View type | Attribute group
TotalStorage Ranks | TABLE | TotalStorageDS Rank
Operations per Second | BAR | TotalStorageDS Rank
Average Response Time | BAR | TotalStorageDS Rank

TotalStorage Volume History workspace
View | View type | Attribute group
TotalStorage Volumes | TABLE | Cache Devices
Physical I/O Rate | BAR | Cache Devices
Physical Response Time | BAR | Cache Devices

TotalStorage Configuration workspace
View | View type | Attribute group
Average Read Response Time | BAR | TotalStorageDS Extent Pool
Average Write Response Time | BAR | TotalStorageDS Extent Pool
TotalStorage Extent Pools | TABLE | TotalStorageDS Extent Pool
TotalStorage SSIDs | TABLE | TotalStorageDS SSIDs
TotalStorage Configuration | TABLE | TotalStorageDS Configuration

Cache CU Destaging Trend workspace
View | View type | Attribute group
Cache Control Unit Performance Trend | TABLE | Cache Control Unit
Cache CU Physical Activity | PLOT | Cache Control Unit

Cache CU Volume Destaging workspace
View | View type | Attribute group
Physical Volume Activity | BAR | Cache Devices
Volume Cache Destaging Report | TABLE | Cache Devices

Volume Destaging Trend workspace
View | View type | Attribute group
Volume Destaging Trend | TABLE | Cache Devices
Physical Volume Activity | PLOT | Cache Devices

Volume Destaging History workspace
View | View type | Attribute group
Physical Volume Activity | BAR | Cache Devices
Volume Historical Destaging Report | TABLE | Cache Devices

Cache CU Staging Trend workspace
View | View type | Attribute group
Cache CU Physical Activity | PLOT | Cache Control Unit
Cache Control Unit Performance Trend | TABLE | Cache Control Unit

Cache CU Volume Staging workspace
View | View type | Attribute group
Volume Cache Staging Report | TABLE | Cache Devices
Physical Volume Activity | BAR | Cache Devices

Volume Staging Trend workspace
View | View type | Attribute group
Volume Staging Trend | TABLE | Cache Devices
Physical Volume Activity | PLOT | Cache Devices

Volume Staging History workspace
View | View type | Attribute group
Volume Historical Staging Report | TABLE | Cache Devices
Physical Volume Activity | BAR | Cache Devices

Cache CU Volume DFW Retry workspace
View | View type | Attribute group
Volume Cache DFW Retry Report | TABLE | Cache Devices
DFW Retry % | BAR | Cache Devices
DFW Hit % | BAR | Cache Devices

Cache CU DFW Retry Trend workspace
View | View type | Attribute group
DFW Retry % | PLOT | Cache Control Unit
Cache Control Unit DFW Retry Trend | TABLE | Cache Control Unit

Cache CU Volume DFW Retry History workspace
View | View type | Attribute group
Volume Cache Report | TABLE | Cache Devices
DFW Retry % | BAR | Cache Devices
DFW Hit % | BAR | Cache Devices

Cache CU Volume Read Hit Percent workspace
View | View type | Attribute group
Volume Cache Report | TABLE | Cache Devices
Read Hit Percent | BAR | Cache Devices
Write Hit Percent | BAR | Cache Devices

Cache CU Read Hit Percent Trend workspace
View | View type | Attribute group
Cache CU Read Hit Percent | PLOT | Cache Control Unit
Cache Control Unit Performance Trend | TABLE | Cache Control Unit

Cache CU Volume Read Hit Percent History workspace
View | View type | Attribute group
Volume Cache Report | TABLE | Cache Devices
Read Hit Percent | BAR | Cache Devices
Write Hit Percent | BAR | Cache Devices

Cache CU Volume Write Hit Percent workspace
View | View type | Attribute group
Volume Cache Report | TABLE | Cache Devices
Write Hit Percent | BAR | Cache Devices
Read Hit Percent | BAR | Cache Devices

Cache CU Write Hit Percent Trend workspace
View | View type | Attribute group
Cache CU Write Hit Percent | PLOT | Cache Control Unit
Cache Control Unit Performance Trend | TABLE | Cache Control Unit

Cache CU Volume Write Hit Percent History workspace
View | View type | Attribute group
Volume Cache Report | TABLE | Cache Devices
Write Hit Percent | BAR | Cache Devices
Read Hit Percent | BAR | Cache Devices

Cache CU Volume Inactive Status workspace
View | View type | Attribute group
Volume Cache Report | TABLE | Cache Devices
I/O Count | BAR | Cache Devices

Lowest Volume Read Hit Percent workspace
View | View type | Attribute group
Volumes With Lowest Read Hit Percent | TABLE | Cache Devices
Lowest Read Hit Percent | BAR | Cache Devices
Staging Rate | BAR | Cache Devices

Lowest Volume Write Hit Percent workspace
View | View type | Attribute group
Volumes With Lowest Write Hit Percent | TABLE | Cache Devices
Lowest Write Hit Percent | BAR | Cache Devices
Staging Rate | BAR | Cache Devices

Lowest Volume DFW Hit Percent workspace
View | View type | Attribute group
Volumes With Lowest DFW Hit Percent | TABLE | Cache Devices
Lowest DFW Hit Percent | BAR | Cache Devices
DFW Retry Percent | BAR | Cache Devices

Highest Volume Destaging Rate workspace
View | View type | Attribute group
Volumes With Highest Destaging Rate | TABLE | Cache Devices
Highest Destaging Rate | BAR | Cache Devices
Volume Staging Rate | BAR | Cache Devices

Highest Volume Staging Rate workspace
View | View type | Attribute group
Volumes With Highest Staging Rate | TABLE | Cache Devices
Highest Staging Rate | BAR | Cache Devices
Volume Destaging Rate | BAR | Cache Devices

Lowest Volume CU Read Hit Percent workspace
View | View type | Attribute group
Lowest Volume Read Hit Percent Report | TABLE | Cache Devices
Lowest Read Hit Percent | BAR | Cache Devices
Staging Rate | BAR | Cache Devices

Lowest Volume CU Write Hit Percent workspace
View | View type | Attribute group
Lowest Volume Write Hit Percent Report | TABLE | Cache Devices
Lowest Write Hit Percent | BAR | Cache Devices
Staging Rate | BAR | Cache Devices

Lowest Volume CU DFW Hit Percent workspace
View | View type | Attribute group
Lowest Volume DFW Hit Percent Report | TABLE | Cache Devices
Lowest DFW Hit Percent | BAR | Cache Devices
DFW Retry Percent > 0 | BAR | Cache Devices

Highest Volume CU Destaging Rate workspace
View | View type | Attribute group
Highest Volume Destaging Rate Report | TABLE | Cache Devices
Highest Destaging Rate | BAR | Cache Devices
Volume Staging Rate > 0 | BAR | Cache Devices

Highest Volume CU Staging Rate workspace
View | View type | Attribute group
Highest Volume Staging Rate Report | TABLE | Cache Devices
Highest Staging Rate | BAR | Cache Devices
Volume Destaging Rate > 0 | BAR | Cache Devices