Oracle 11gR2 clusterware启动顺序

从1gR2起Oracle引入init.ohasd，将其配置在/etc/inittab中，用以启动和管理clusterware相关资源

Pre 11R2

/etc/inittab

h1:2:respawn:/etc/init.evmd run >/dev/null 2>&1 </dev/null

h2:2:respawn:/etc/init.cssd fatal >/dev/null 2>&1 </dev/null

h3:2:respawn:/etc/init.crsd run >/dev/null 2>&1 </dev/null

$ who -r

  .       run-level 2 Jan 22 05:49      2   0   S

11R2

/etc/inittab

h1:2:respawn:/etc/init.ohasd run >/dev/null 2>&1 </dev/null

oracle> who -r

  .       run-level 2 Jul 03 07:52      2   0   S

 

clusterware资源大致可分为4级，其相应启动顺序如下：

先由INIT启动init.ohasd，后者再启动相应的4个进程，然后按顺序依次启动

Level 1: OHASD Spawns:

cssdagent - Agent responsible for spawning CSSD.

orarootagent - Agent responsible for managing all root owned ohasd resources.

oraagent - Agent responsible for managing all oracle owned ohasd resources.

cssdmonitor - Monitors CSSD and node health (along wth the cssdagent).

Level 2: OHASD rootagent spawns:

CRSD - Primary daemon responsible for managing cluster resources.

CTSSD - Cluster Time Synchronization Services Daemon

Diskmon

ACFS (ASM Cluster File System) Drivers 

Level 2: OHASD oraagent spawns:

MDNSD - Used for DNS lookup

GIPCD - Used for inter-process and inter-node communication

GPNPD - Grid Plug & Play Profile Daemon

EVMD - Event Monitor Daemon

ASM - Resource for monitoring ASM instances

Level 3: CRSD spawns:

orarootagent - Agent responsible for managing all root owned crsd resources.

oraagent - Agent responsible for managing all oracle owned crsd resources.

Level 4: CRSD rootagent spawns:

Network resource - To monitor the public network

SCAN VIP(s) - Single Client Access Name Virtual IPs

Node VIPs - One per node

ACFS Registery - For mounting ASM Cluster File System

GNS VIP (optional) - VIP for GNS

Level 4: CRSD oraagent spawns:

ASM Resouce - ASM Instance(s) resource

Diskgroup - Used for managing/monitoring ASM diskgroups.  

DB Resource - Used for monitoring and managing the DB and instances

SCAN Listener - Listener for single client access name, listening on SCAN VIP

Listener - Node listener listening on the Node VIP

Services - Used for monitoring and managing services

ONS - Oracle Notification Service

eONS - Enhanced Oracle Notification Service

GSD - For 9i backward compatibility

GNS (optional) - Grid Naming Service - Performs name resolution

调用crsctl status resource �Ct可以查看所有component的状态