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104 Troubleshooting the SAN
Checking the Command Flow Log
Two kinds of events are recorded in the command flow log (CFL) file: sequence events and single command
events. Sequence events are Read/Write commands. All other events are single command events. You can
retrieve the CFL log file for use as a diagnostic tool.
Not all appliances in the SAN are capable of providing CFL data. If the appliance you select is not capable
of communicating this information, Command Flow Log does not appear on the appliance menu.
1 Right-click an appliance in the navigation panel or the graphical panel.
2 Select Command Flow Log.
The system attempts to log the user on to the SNC FTP server. If no default logon account is found, the
user is prompted to enter logon credentials. After you have logged on, the Save Command Flow Log
dialog box is displayed.
3 Navigate to the location you want to save the log to. Enter a filename.
4 Click Save.
The number of bytes being saved is shown and is updated periodically until the entire file is saved.
5 Open the log file with a text editor.
Interpreting CFL Output
SCSI commands flow through SNCs connected to tape libraries. These commands are logged in command
flow log (CFL) areas on the SNC. CFLs exist for each target, including the SNC, up to a maximum of 10
targets. The following information is recorded in the CFL:
• LUN number of the device for which information is being provided.
• Device’s vendor, product ID, and serial number
• Month, day of the month, start time
• Initiator channel, initiator index
•Event name
• Number of times the SNC carried out the event
• Number of errors recorded in the course of the event being carried out
• Direction of data transfer (to or from the host)
• Number of bytes actually transferred
• Operation code
• Command descriptor block
• Command completion status
•End time
- User’s Guide 1
- 89558 Böhmenkirch 2
- Contents 3
- 6 Managing User Accounts 39 5
- 7 Working with Portals 43 5
- 11 Configuring SAN Access 75 6
- 12 Troubleshooting the SAN 93 6
- A Glossary 107 7
- Description 11
- Using the SAN Client 12
- Event Logging 12
- 6 Description 14
- 8 Description 16
- Getting Started 17
- Before Installing AMC 18
- Installing the AMC Server 19
- 12 Getting Started 20
- Launching the AMC Server 21
- Installing the AMC Client 22
- Launching the AMC Client 23
- Connecting to the Server 24
- Logging on 25
- Logging off 26
- Exiting the AMC Client 27
- Shutting Down the AMC Server 27
- 20 Getting Started 28
- Frequently Asked Questions 29
- 22 Frequently Asked Questions 30
- How do I create policies? 31
- 24 Frequently Asked Questions 32
- The SAN Management Interface 33
- Received Event Trap Window 34
- Scalar i2000 38
- Device Numbering 40
- Graphical Panel 40
- Data Panel 41
- Max Speed 42
- Status/Message Area 43
- Common SAN Management Options 44
- Managing User Accounts 47
- 40 Managing User Accounts 48
- Adding a New User Account 49
- Modifying a User Account 50
- Deleting a User Account 50
- Working with Portals 51
- Modifying a Portal 52
- Deleting a Portal 53
- 46 Working with Portals 54
- Working with SAN Categories 55
- Creating a new Category 56
- Renaming a Category 56
- Deleting a Category 56
- Moving a Category 57
- Moving Items by Drag and Drop 57
- Working With Views 59
- Opening Saved Views 60
- Creating Views 60
- Saving Views 62
- Deleting Views 62
- Searching the Current View 62
- Reporting the Current View 63
- Configuring Email 65
- Configuring Policies 66
- Discovering the SAN 67
- Rediscovering a Segment 68
- Managing the SAN Appliance 69
- Refreshing Data 70
- Updating Firmware 72
- Using Restart 72
- Displaying RMU Data 73
- Managing the SCSI Channel 75
- Configuring the SCSI Channel 76
- Managing the Fibre Channel 77
- Resetting the Fibre Channel 78
- Configuring the Fibre Channel 78
- Managing a Device 80
- Editing Device Maps 81
- Pre-Assigning Device Numbers 82
- Configuring SAN Access 83
- Using Channel Zoning 84
- Data Mover Module 84
- Installing HRS 85
- 78 Configuring SAN Access 86
- 80 Configuring SAN Access 88
- Installing SFM 89
- 82 Configuring SAN Access 90
- Adding SFM Hosts 91
- Using eVPS 92
- Installing eVPS 93
- 86 Configuring SAN Access 94
- 88 Configuring SAN Access 96
- Deleting eVPS Hosts 97
- Using the eVPS View Menu 97
- Using VPM 98
- Making VPM assignments 99
- 92 Configuring SAN Access 100
- Troubleshooting the SAN 101
- Interpreting the Event Log 102
- 96 Troubleshooting the SAN 104
- Receiving Event Traps 105
- Monitoring the LED Panel 106
- Figure 21 SNC 4000 LED panel 107
- Figure 22 SNC 5100 LED panel 107
- Using Identify 108
- Monitoring Environmental Data 109
- Using Health Check 110
- Obtaining a Drive Dump 111
- Checking the Command Flow Log 112
- 106 Troubleshooting the SAN 114
- Glossary 115
- 108 Glossary 116
- 110 Glossary 118
- 112 Index 120
- 114 Index 122
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