Artesyn System Management Interface Based on HPI-B (Centel User Manual download pdf (Page 44)

Using HPI-B

System Management Interface Based on HPI-B (Centellis 2000 R3.0/4411) User’s Guide (6806800P20C)

Any FRUs available in a shelf are represented as HPI resources together with Resource Data

Records (RDRs) corresponding to that FRU. Whenever a FRU is added to or removed from a

shelf, the corresponding HPI resource/RDR is added/removed from the HPI domain.

4.4.2 Accessing HPI Domains

In order to access an HPI domain, you must open a session via the HPI call

saHpiSessionOpen() and provide as first parameter the domain ID of the corresponding

HPI domain. How to obtain the domain ID is described later within this section about the

multishelf HPI library.

If you want to access several shelves, then you need to open several sessions simultaneously,

one session for each HPI domain which represents a shelf. It is also possible to open several

sessions for one HPI domain/shelf only as well.

When the connection to a shelf is lost, all running HPI calls which access the corresponding

domain return immediately with the error code SA_HPI_ERR_NO_RESPONSE. All open

sessions for the affected domain are automatically closed by the multishelf library. In the

meantime, the library tries to regain access to the shelf. As soon as the connection is

reestablished, the domain is recreated and the application can open another session and

access the domain again. Whenever a domain is created or removed, an HPI event from the HPI

Communication State sensor is generated in the default domain (see Connection State Sensor

on page 50 and HPI Domain Events on page 51).

HPI events are handled domain wide. This means that HPI events from a shelf or FRUs in that

shelf are only visible and can only be received within the session that corresponds to that

domain.

4.4.3 How Domains and Shelves are Represented

As previously mentioned, each HPI implementation has at least the default domain. It has the

ID 0 assigned to it.

Starting with HPI-B, the default domain contains a Domain Reference Table, which contains

references to all related domains and may be used by applications for discovery of available

domains in the current configuration. For more information about the Domain Reference

Table, refer to the HPI-B specification document of the SAI-HPI-B.02.01 standard.

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Artesyn System Management Interface Based on HPI-B (Centel User Manual Page 44