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This article introduces the relevant knowledge of "what is the role of agent under the RAC cluster in the database". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

In the cluster, except for the ohasd process, the other processes and resources become resources. Each resource is managed by agent, including that crsd.bin exists as the initialization resource of ora.crsd. There are a total of 7 agent. The features are as follows:

Ohas is responsible for initializing the resources agent, crsd is responsible for the upper application resources agent

/ log//agent/ohasd:

/ log//agent/ohasd/oraagent_grid: start / stop / check / clear ora.asm, ora.evmd, ora.gipcd, ora.gpnpd, ora.mdnsd and other resources.

/ log//agent/ohasd/orarootagent_root: start / stop / check / clear ora.crsd, ora.ctssd, ora.diskmon, ora.drivers.acfs, ora.crf (11.2.0.2) and other resources.

/ log//agent/ohasd/oracssdagent_root: start / stop / check the ocssd process.

/ log//agent/ohasd/oracssdmonitor_root: monitor the cssdagent process

/ log//agent/crsd:

/ log//agent/crsd/oraagent_grid: start / stop / check / clear asm, ora.eons, ora.LISTENER.lsnr, SCAN listeners, ora.ons, diskgroup and other resources

/ log//agent/crsd/oraagent_oracle: start / stop / check / clear service, database and other resources

/ log//agent/crsd/orarootagent_root: start / stop / check / clear GNS, VIP, SCAN VIP and network and other resources.

/ log//agent/crsd/scriptagent_grid: log of customized application services, start cvu

Some basic concepts about agent

-- EP (entry point), which is used to specify the operations / actions of agent on resources. Supported EP: start, stop, check, abort, clean (resource problems occur before restart or Failover)

EP supported states: online, offline, unknown, patial (intermediate), failed (clean EP followed by restart or faileover), intermediate (intermediate state, or online not in the node it should be)

-- PE (policy engine): crsd is a distributed cluster management component, which adopts master-slave mode. A node in the cluster (usually the node that recently started crsd) acts as PE master. All resources in the cluster are operated through the crsd of pe master, and then the agent of other nodes is distributed, during which each module of crs coordinates the work.

. / crsctl lsmodules crs viewable crs components

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