Evmd：事件管理守护进程。这个进程也会启动racgevt进程来管理Fan进程的调用
- Generates events when things happen
当意外发生时产生事件
- Spawns a permanent child evmlogger
产生一个永久子进程--evmlogger
- Evmlogger, on demand, spawns children
Evmlogger会根据实际情况自动产生子进程
- Scans callout directory and invokes callouts.
- Runs as Oracle.
以oracle用户身份运行
- Restarted automatically on failure
异常后能够自动重启
ocssd:Manages cluster node membership and runs as the oracle user; failureof this process results in cluster restart.
Ocssd：管理集群节点成员资格，以oracle用户身份运行；该进程在异常时会自动重启
- OCSSD isrequired with RAC databases and with non-RAC database when using ASM
使用 rac数据库，或者单实例使用asm的数据库都需要ocssd
- Provides access to node membership
提供对节点成员的访问
- Provides group services
提供组服务
- Provides basic cluster locking
提供基本的集群锁
- Integrates with existing vendor clusteware, when present
当有第3方集群软件时能和他自动整合
- Can also runs without integration to vendor clustware
即使没有第3方集群软件，也能够运行
- Runs as Oracle.
oracle用户运行
- Failure exit causes machine reboot(RAC cluster only).
该进程异常会导致机器重启
--- This is a feature to prevent data corruption in event of a split brain.
这个特性用来在发生脑裂时保护数据免收破坏。
oprocd : Process monitor for the cluster. Note that this process onlyappears on platforms that do not use vendor clusterware with OracleClusterware.
Oprocd：为集群提供进程监控。这个进程只有当没有使用第3方集群时才会出现