LLSC Recovery Help


Statistics Overview and Use

The ServerNet PCI Adapter (SPA) is typically one of several cards on the host node's PCI bus. When the link layer self-check (LLSC) statistics indicate a significant number of SAIL ASIC self checks have occurred (SPA is having to wait too long to acquire the PCI bus), cluster communications performance for the node may suffer significantly and (in some cases) the node may be removed from the cluster. In this case, consideration should be given to moving the SPA to a higher priority PCI slot in the node.

NOTE: A SAIL ASIC self check refers to the process whereby the ASIC detects a problem serious enough to warrant aborting its normal operation.

The LLSC and recovery statistics are cleared to zero for a given SPA when the associated node is booted. In addition, the LLSC Recovery view can be used by those with root permission to reset the LLSC and recovery statistics for any SPA in the cluster.


Statistics Description

The SAIL ASIC self-check recovery process performed by the SPAD (SPA driver) saves the SAIL registers, resets the SPA, restores the SAIL registers, and restarts the SPA. The following statistics are maintained for this self check and recovery process:

Viewing Statistics

The statistics are displayed in one pane labeled For SPA N (where N is the SPA number).  Associated with the pane is a SPA choice box used to select the SPA for which the LLSC and recovery statistics are retrieved.

Procedure

Select the SPA number with the SPA choice box; the statistics for the selected SPA are displayed.

Resetting Statistics

To reset all LLSC and recovery statistics for the selected SPA, click on the Reset button (available only to users with root permission).