ProCurve 9304m Diagnostics Manual page 73

Using the Backplane Debugging Commands
For debugging purposes, you can monitor information about the backplane hardware on a Chassis device. When
the backplane debugging feature is enabled, every 30 seconds the device checks the following counters: SMC
DMA Drop counters (DMADrop), SMC Backplane Drop counters (BPDrop), BM Free Queue Depth counters
(FreeDepth), and BM Write Sequence Drop counters (WriteDrop). The device generates a Syslog message when
any of the following conditions are true:
• DMADrop count is non-zero
• BPDrop count is non-zero
• WriteDrop count is greater than or equal to 1,500 increments per 30 seconds
• If the queue depth indicated by the FreeDepth counters is 120 less than the management module's
approximate maximum free queue depth for 3 consecutive measurements.
• On T-Flow Redundant Management Module, the maximum free queue depth is approximately 4000.
• On Management 4 modules, the maximum free queue depth is approximately 3960.
• On Management 1 and Management 2, the maximum free queue depth is approximately 890.
To enable the backplane debugging feature, enter the following command:
ProCurveRS# debug hw
Syntax: [no] debug hw
To disable the backplane debugging feature, enter one of the following commands:
ProCurveRS# no debug hw
or
ProCurveRS# undebug hw
Syntax: undebug hw
Entering the no debug hw or undebug hw commands stops the backplane debugging feature, but does not clear
the WriteDrop counters (the other counters are cleared once they are read). To clear the WriteDrop counters, you
can either reboot the device, or enter the following command:
ProCurveRS# clear hw writedrop
Syntax: clear hw writedrop
June 2005
Chapter 4
4 - 1