Oracle B32100-01 - Manual (Page 131)

Installing an OracleAS Cold Failover Cluster (Infrastructure) Configuration
Installing in High Availability Environments: OracleAS Cold Failover Cluster 8-7
Figure 8–1 OracleAS Cold Failover Cluster (Infrastructure) Configuration
The figure shows:
■
two nodes running clusterware
■
storage devices local to each node
■
storage device that can be accessed by both nodes. You install OracleAS
Infrastructure on this shared storage device.
During normal operation, one node ("node 1") acts as the active node. It mounts the
shared storage to access the OracleAS Infrastructure files, runs OracleAS Infrastructure
processes, and handles all requests.
If the active node goes down for any reason, the clusterware fails over OracleAS
Infrastructure processes to the other node ("node 2"), which now becomes the active
node. It mounts the shared storage, runs the processes, and handles all requests.
These nodes appear as one computer to clients through the use of a virtual address. To
access the OracleAS Infrastructure, clients, including middle-tier components and
applications, use the virtual address associated with the cluster. The virtual address is
associated with the active node (node 1 during normal operation, node 2 if node 1 goes
down). Clients do not need to know which node (node 1 or node 2) is servicing
requests.
You use the virtual hostname in URLs that access the infrastructure. For example, if
vhost.mydomain.com
is the virtual hostname, the URLs for the Oracle HTTP Server
and the Application Server Control would look like the following:
URL for: Example URL
Oracle HTTP Server, Welcome page http://vhost.mydomain.com:7777
Oracle HTTP Server, secure mode https://vhost.mydomain.com:4443
Shared
Storage
Node 1
(Primary Node, Active)
Node 2
(Secondary Node)
Physical IP:
123.45.67.22
Physical IP:
123.45.67.33
Virtual Hostname: vhost.mydomain.com
Virtual IP: 123.45.67.11
on failover
on failover
Node 1
(Primary Node)
Node 2
(Secondary Node, Active)
Physical IP:
123.45.67.22
Physical IP:
123.45.67.33
Virtual Hostname: vhost.mydomain.com
Virtual IP: 123.45.67.11
Normal Mode Failover Mode
oraInventory Directory
OracleAS Infrastructure OracleAS Infrastructure
Shared
Storage
oraInventory Directory