What is Cluster, requirements to build
cluster database.
Oracle clusterware enables one or more than
servers into single unit and communicate each other. Oracle cluster manages
the resources such as server names, VIP’s, private IP’s, Public IP’s, scan IP’s,
databases, listeners, instances, services and so on, and these resources doesn’t
allow to modify. For example resources names like as ora.host_name.resource_name.
Hardware
requirements for the Oracle RAC
Hardware components (Servers) of the
clusterware is similar. However, a server is part of the cluster requires
second network to communicate each other, this second network is called as the
interconnect. This interconnect network is a private network using a switch
that only the nodes in the cluster can access.
Note: Oracle doesn’t support using cross
cables as clusterware interconnects.
1.
At least two network interfaces
to the public network.
2.
At least two network interfaces
to the private interconnect network.
Storage requirements for the Oracle
Clusterware / Grid infrastructure:
The clusterware servers required common shared
storage (cluster-aware storage) mounted in all servers. Oracle clusterware
supports NFS, iSCSI, DAS, NAS and SAN storage's.
Oracle
RAC/Grid Components:
OCR
OCR
Voting Disk
OLR
Networking
Configurations:
Scan IP’s
Scan IP’s
Public IP’s
Private IP’s
Virtual IP’s
Oracle
Clusterware Stack:
1. Cluster ready services
Stack
2. Oracle high availability
services stack
Cluster
Ready Services Stack:
1. Cluster Ready Services
(CRS)
2. Cluster Synchronization
Services (CSS)
3. Oracle ASM
4. Cluster Time
Synchronization Service
5. Event Management (EVM)
6. Oracle Notification
Service (ONS)
7. Oracle Agent (oraagent)
8. Oracle Root Agent
(orarootagent)
Oracle
High Availability Service Stack:
1. Cluster Logger service
(ologgerd)
2. System Monitor Service
(osysmond)
3. Grid Plug and Play (GPNPD)
4. Grid interprocess
Communication (GIPC)
5. Multicast Domain Name
Service (mDNS)
6. Oracle Grid Naming Service
(GNS)
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