Compaq SC RMS 4.5 The Switch Network Manager, 4.6 The Transaction Log Manager

The TransactionLog Manager

Conﬁguration information about each partition is held in the partitions table (see

Section 10.2.16). The information is indexed by the name of the partition together with

the name of the active conﬁguration.

4.5 The Switch Network Manager

The Switch Network Manager,swmgr, controls and monitors the Compaq AlphaServer

SC Interconnect (see Appendix A (Compaq AlphaServer SC Interconnect Terms)). It does

this using the switch network control interface connected to the parallel port of the

primary management node. If swmgr detects an error in the switch network, it updates

the status of the switch concerned and generates an event.

swmgr collects fan, power supply and temperature data from the Compaq AlphaServer

SC Interconnect modules,updating status informationand generating events if

components fail or temperatures exceed their operating limits. See Section 9.5.4 for

site-speciﬁc details of conﬁguring the swmgr.

The Switch Network Manager creates and maintains the entries in the elites table

(see Section 10.2.5) and the switch_boards table (see Section 10.2.22). It maintains

entries in the elans table (see Section 10.2.4). In the event of errors, it creates entries

in the link_errors table (see Section 10.2.11).

4.6 The Transaction Log Manager

The Transaction Log Manager,tlogmgr, executes change of state requests that have

been entered in the transactions table (see Section 10.2.23) by RMS administrative

clients. This mechanism is employed to serialize changes to the database and to provide

an audit trail of such changes.

The entry in the transactions table records who requested the change, and names the

service required togetherwith any arguments to pass to the process on startup. A

transaction handle (a unique ID) is generated for the entry and passed to both theclient

and the RMS daemon that provides the service.

The RMS daemon uses the transaction handle to label any results it produces, such as an

entry in the transaction_outputs table (see Section 10.1.3). The client uses the

handle to select the result from the relevant table. Output from the service is appended

to an output log. The name of this log is enteredin the transactions table together

with the status of the transaction.

The services that are available are listed in the servicestable (see Section10.2.20).

RMS Daemons 4-5