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 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.

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
Hitachi Data Systems 2107 Configuration Hitachi Data Systems 2107 Parity Groups Hitachi Data Systems 2107 Array Configuration Hitachi Data Systems 2107 Parity Group Trend Hitachi Data Systems 2107 Extent Pool Volumes Hitachi Data Systems 2107 Volume Trend Hitachi Data Systems 2107 Extent Pool Trend Hitachi Data Systems 2107 Parity Group History Hitachi Data Systems 2107 Extent Pool Volume History Hitachi Data Systems 2107 CU Volumes Hitachi Data Systems 2107 Volume Trend 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:

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 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 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 Cache CU Performance node.

See Cache CU Performance workspace for more information on the primary workspace for this node.

Table 2. 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

Table 3. 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

Table 4. 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

Table 5. 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

Table 6. 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

Table 7. Symmetrix Disk Director Summary workspace
View	View type	Attribute group
Logical Volumes Per Disk	BAR	Symmetrix Director Summary
Cache Efficiency	BAR	Symmetrix Directors

Table 8. Symmetrix Devices workspace
View	View type	Attribute group
Devices with Mirrors in Error	TABLE	Symmetrix Devices
Symmetrix Devices	TABLE	Symmetrix Devices

Table 9. 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

Table 10. Volume Cache Trend workspace
View	View type	Attribute group
Volume Cache Trend	TABLE	Cache Devices
Cache Hit Percent	PLOT	Cache Devices

Table 11. 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

Table 12. 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

Table 13. Cache CU Raid Rank Trend workspace
View	View type	Attribute group
Raid Rank Report	TABLE	Cache Raid Rank
Response Time	PLOT	Cache Raid Rank

Table 14. 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

Table 15. TotalStorage Array Configuration workspace
View	View type	Attribute group
DDM Capacity	BAR	TotalStorageDS Array
TotalStorage Arrays	TABLE	TotalStorageDS Array
DDM Speed	BAR	TotalStorageDS Array

Table 16. 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

Table 17. 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

Table 18. TotalStorage Extent Pool Trend workspace
View	View type	Attribute group
TotalStorage Extent Pool Trend	TABLE	TotalStorageDS Extent Pool
Response Time	PLOT	TotalStorageDS Extent Pool

Table 19. TotalStorage Ranks Trend workspace
View	View type	Attribute group
TotalStorage Ranks Trend	TABLE	TotalStorageDS Rank
Average Response Time	PLOT	TotalStorageDS Rank

Table 20. TotalStorage Volume Trend workspace
View	View type	Attribute group
TotalStorage Volume Trend	TABLE	Cache Devices
Physical Response Time	PLOT	Cache Devices

Table 21. 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

Table 22. 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

Table 23. 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

Table 24. 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

Table 25. Cache CU Volume Destaging workspace
View	View type	Attribute group
Physical Volume Activity	BAR	Cache Devices
Volume Cache Destaging Report	TABLE	Cache Devices

Table 26. Volume Destaging Trend workspace
View	View type	Attribute group
Volume Destaging Trend	TABLE	Cache Devices
Physical Volume Activity	PLOT	Cache Devices

Table 27. Volume Destaging History workspace
View	View type	Attribute group
Physical Volume Activity	BAR	Cache Devices
Volume Historical Destaging Report	TABLE	Cache Devices

Table 28. 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

Table 29. Cache CU Volume Staging workspace
View	View type	Attribute group
Volume Cache Staging Report	TABLE	Cache Devices
Physical Volume Activity	BAR	Cache Devices

Table 30. Volume Staging Trend workspace
View	View type	Attribute group
Volume Staging Trend	TABLE	Cache Devices
Physical Volume Activity	PLOT	Cache Devices

Table 31. Volume Staging History workspace
View	View type	Attribute group
Volume Historical Staging Report	TABLE	Cache Devices
Physical Volume Activity	BAR	Cache Devices

Table 32. 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

Table 33. 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

Table 34. 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

Table 35. 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

Table 36. 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

Table 37. 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

Table 38. 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

Table 39. 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

Table 40. 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

Table 41. Cache CU Volume Inactive Status workspace
View	View type	Attribute group
Volume Cache Report	TABLE	Cache Devices
I/O Count	BAR	Cache Devices

Table 42. 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

Table 43. 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

Table 44. 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

Table 45. 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

Table 46. 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

Table 47. 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

Table 48. 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

Table 49. 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

Table 50. 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

Table 51. 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

Table 52. Hitachi Data Systems 2107 Parity Groups workspace
View	View type	Attribute group
HDS 2107 Parity Groups	TABLE	TotalStorageDS Rank
Operations Per Second	BAR	TotalStorageDS Rank
Average Response Time	BAR	TotalStorageDS Rank

Table 53. Hitachi Data Systems 2107 Array Configuration workspace
View	View type	Attribute group
DDM Capacity	BAR	TotalStorageDS Array
HDS 2107 Arrays	TABLE	TotalStorageDS Array
DDM Speed	BAR	TotalStorageDS Array

Table 54. Hitachi Data Systems 2107 CU Volumes workspace
View	View type	Attribute group
HDS 2107 CU Volumes	TABLE	Cache Devices
Physical I/O Rate	BAR	Cache Devices
Physical Response Time	BAR	Cache Devices

Table 55. Hitachi Data Systems 2107 Extent Pool Volumes workspace
View	View type	Attribute group
HDS 2107 Extent Pool Volumes	TABLE	Cache Devices
Physical I/O Rate	BAR	Cache Devices
Average Physical Response Time	BAR	Cache Devices

Table 56. Hitachi Data Systems 2107 Extent Pool Trend workspace
View	View type	Attribute group
HDS 2107 Extent Pool Trend	TABLE	TotalStorageDS Extent Pool
Response Time	PLOT	TotalStorageDS Extent Pool

Table 57. Hitachi Data Systems 2107 Parity Group Trend workspace
View	View type	Attribute group
HDS 2107 Parity Group Trend	TABLE	TotalStorageDS Rank
Average Response Time	PLOT	TotalStorageDS Rank

Table 58. Hitachi Data Systems 2107 Volume Trend workspace
View	View type	Attribute group
HDS 2107 Volume Trend	TABLE	Cache Devices
Physical Response Time	PLOT	Cache Devices

Table 59. Hitachi Data Systems 2107 Parity Group History workspace
View	View type	Attribute group
HDS 2107 Parity Groups	TABLE	TotalStorageDS Rank
Operations per Second	BAR	TotalStorageDS Rank
Average Response Time	BAR	TotalStorageDS Rank

Table 60. Hitachi Data Systems 2107 Extent Pool Volume History workspace
View	View type	Attribute group
HDS 2107 Volumes	TABLE	Cache Devices
Physical I/O Rate	BAR	Cache Devices
Physical Response Time	BAR	Cache Devices

Table 61. Hitachi Data Systems 2107 Configuration workspace
View	View type	Attribute group
Average Read Response Time	BAR	TotalStorageDS Extent Pool
Average Write Response Time	BAR	TotalStorageDS Extent Pool
HDS 2107 Extent Pools	TABLE	TotalStorageDS Extent Pool
HDS 2107 SSIDs	TABLE	TotalStorageDS SSIDs
HDS 2107 Configuration	TABLE	TotalStorageDS Configuration