Types of Error Recovery

PCI ER decreases the frequency of crashes, service calls, & repair rates for PCI errors by a factor of 20 to 25 times. Without PCI error recovery, the entry-level system I/O errors account for more than 20% of all errors in the system.

Tables below list the time taken by the PCI/PCIe cards to recover from PCI errors with the error recovery feature.

Table 1: PCI / PCIe Card Recovery with PCI Error Recovery Feature on Legacy Platform

Event	Time Taken
PCI / PCIx slot card	In the range:
recovery	10 secs – 2.5 mins
PCIe card recovery	~ 6 secs

Table 2: PCIe Card Recovery with PCI Error Recovery Feature on HP Superdome 2 Platform

Event	Time Taken
PCIe card recovery	~ 5 secs

Refer to concurrent dump whitepaper (link provided below) for details on time taken for the system to recover from MCA due to PCI I/O errors, without error recovery functionality.

http://www.hp.com/go/hpux-core-docs under HP-UX 11i v3 category.

The PCI/PCIe cards can be recovered from the errors either manually or automatically.

Manual recovery, also known as Error Handling, is supported on HP-UX 11i v2 OS on legacy platforms only. In this type of error recovery, the PCI / PCIe cards are isolated due to errors and must be manually recovered. Users can use olrad (1 M) command or Attention Button to recover the cards manually.

Automatic recovery, also known as Error Recovery, is supported on HP-UX 11i v3 OS. In this type of error recovery, the PCI / PCIe cards that are isolated because of errors are automatically recovered by the core PSM (Platform Support Module).

Table 3 provides the error recovery OS support details.

Table 3: Error Recovery OS Support Details

Types of	OS Support
Error
Recovery

Manual error	On HP-UX 11i v1 and HP-UX 11i v2 OS legacy platforms, users
recovery	are required to manually recover* cards from PCI errors.
recovery
	Non hot-pluggable slots are not supported on HP-UX 11i v1
	and HP-UX 11i v2 systems.