HP Medical Archive Solution manual ADC-Administrative Domain Controller, ADC Attributes

HPMA User Guide

ADC—Administrative Domain Controller

The Administrative Domain Controller (ADC) authenticates the grid nodes and their connections with each other. For two nodes to connect, the ADC must have certificates for both. The ADC maintains the certif- icates and synchronizes this information with the other ADCs in the grid.

In general, all system nodes maintain a connection to at least one ADC. This ensures that the nodes are always accessing the latest certificates (occasionally updated or revoked). When nodes connect they cache other nodes’ certificates, enabling systems to continue functioning with known nodes even when an ADC is unavailable. New nodes can only establish connections via an ADC.

The connection of each node lets the ADC gather topology informa- tion. This node information includes the CPU load, the amount of available disk space (if it has storage), the supported services, and the node’s group ID (location). The grid’s LDRs, CMSs, and CLBs ask the ADC for topology information through topology queries. The ADC responds to each query with the latest information received from the grid.

Group IDs are in the form of 10X00Y, where X and Y are pre-assigned based on the site and cabinet number. For example, cabinet B-3 would have a Group ID of 102003. These are used in placing replications under business rules, to permit the grid to disperse data in the most robust and efficient manner possible within the available topology.

ADC Attributes

The ADC supports the common set of service attributes. These common service attributes appear on the Overview tab for the service.

Table 10: ADC Service Attributes

Attribute	Type / Units	Description		C	T	Alarm
ADC State	Enumerated	Current state of the service:				ADCE
	Text	2	= Online
		1	= Standby
		0	= Offline

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