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Access Path Usage Statistics
An access path is a path through which data and commands are transferred within a storage system.
In a storage system, channel adapters control data transfer between hosts and the cache memory.
Disk adapters control data transfer between the cache memory and hard disk drives. Data transfer
does not occur between channel adapters and disk adapters. Data is transferred via the cache switch
(CSW) to the cache memory.
When the hosts issue commands, the commands are transferred via channel adapters to the shared
memory (SM). The content of the shared memory is checked by disk adapters.
Figure 2 Access Paths
.
Performance Monitor tracks and displays the usage rate for the following access paths.
• Paths between channel adapters and the cache switch
• Paths between disk adapters and the cache switch
• Paths between the cache switch and the cache memory
• Paths between channel adapters and the shared memory
• Paths between disk adapters and the shared memory
For details on how to view usage statistics about access paths, see “Viewing Usage Statistics about
Access Paths” on page 74.
Hard Disk Drive Workload Statistics
If particular hard disk drives or data are heavily accessed, system performance might deteriorate.
Performance Monitor provides statistics about parity groups and logical devices to help you detect
bottlenecks in your system. If you mapped volumes in an external storage system, Performance Monitor
can also monitor the access workloads of the external volume groups and the external volumes.
Performance Monitor displays a line graph that indicates changes in access workloads, so that you
can detect the peak I/O access times.
You will be unable to view workload statistics that expired a specific storing period because such
statistics are erased from the storage system. The storing period of statistics is only short range (between
8 hours to 15 days) and that changes depending on the collecting interval and the number of CUs
to be monitored specified by the user. For details on the storing period of statistics, see “Understanding
Statistical Storage Ranges” on page 16.
Workload information mainly displayed by Performance Monitor is as follows:
• I/O rate
About Performance Monitor22
- HP StorageWorks 1
- DescriptionDateEdition 2
- Contents 3
- Restrictions 13
- 2 About Performance Monitor 15
- Parity Group Usage Statistics 16
- Volume Usage Statistics 17
- About Performance Monitor18 18
- Access Path Usage Statistics 22
- Port Traffic Statistics 23
- LU Path Traffic Statistics 23
- Overview of Export Tool 24
- About Performance Monitor26 26
- Operations 27
- Export Tool Limitations 29
- Performance Monitor Window 31
- Auto LUN Window, Physical Tab 31
- DescriptionItem 33
- Long-Range Storage 36
- Short-Range Storage 37
- Current monitoring status: 49
- Monitoring Switch 49
- Monitoring Options Window 52
- Other Windows 55
- Start Monitoring 57
- View the Monitoring Results 59
- Auto LUN Software User Guide 64
- Monitoring Hard Disk Drives 76
- Viewing I/O Rates for Disks 77
- Monitoring Ports 82
- Monitoring LU Paths 88
- Viewing LU Path I/O Rates 89
- Viewing HBA Information 92
- 6 Using the Export Tool 99
- SeeMonitoring DataWindow 100
- The letters 104
- Data Saved 111
- CSV FileZIP File 111
- Using the Export Tool 120
- Using the Export Tool122 122
- Preparing a Batch File 123
- Running the Export Tool 125
- Command Reference 128
- Command Syntax 129
- Operands 132
- Description 132
- Using the Export Tool134 134
- DescriptionOperand 139
- Probable Causes 159
- Invalid Values of Monit 159
- Using the Export Tool160 160
- 7 Troubleshooting 161
- Calling HP Technical Support 166
- 8 Support and Other Resources 167
- HP Technical Support 168
- Subscription Service 168
- HP Websites 168
- Documentation Feedback 168
- Glossary 169
- Glossary170 170
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