How does the psm work – HP B6191-90029 User Manual
Page 75
Chapter 4
Using the Peripheral Status Monitor
How Does the PSM Work?
75
How Does the PSM Work?
The PSM converts hardware events detected by the EMS Hardware Monitors to “UP” or “DOWN” status,
which is used by MC/ServiceGuard in controlling package failover. Figure 4-1 on page 76 illustrates how the
PSM works with the other components of hardware monitoring.
Because hardware event monitors detect and report the occurrence of events rather that resource status, a
method is required to alert MC/ServiceGuard when a hardware resource has a status that may impact data
availability. The PSM provides this functionality, serving as the interface between the hardware event
monitors and MC/ServiceGuard.
Some monitors can determine when a problem has been corrected and the hardware is functioning properly.
These monitors automatically alert the PSM when the hardware is fixed, and the PSM will return the state of
the hardware to UP. Other monitors do not have the capability of determining when the hardware problem is
corrected. With these monitors it will be necessary for the user to use the set_fixed utility to manually
return the operational state to UP.