HP Serviceguard Toolkit for Enterprise DB PPAS for Linux User Guide Version A.12.00.00

Figure 1 High availability to the EDB PPAS database instance
EDB Package
Primary Node
Node 1
/edb /edb/dev/vgdata
Primary Network
Heartbeat Network
Node 2
Adoptive Node
Local Disk
(PPAS binary)
Shared
PPAS data
Local Disk
(PPAS binary)
In Figure 1, you can configure the EDB PPAS database instance to create a volume group by using
a shared disk that connects both Node 1 and Node 2 in the cluster. You can use the EDB PPAS
toolkit to package this database instance. The EDB package can run on either Node 1 or Node
2. If the primary package fails on Node 1, it fails over to Node 2. You can configure the vgdata
volume group on the shared disks, which can be accessed by Node 1 and Node 2. The EDB PPAS
binaries are placed on the local file system of Node 1 and Node 2.
When an EDB PPAS database instance, running on the primary node fails, or when the primary
node, hosting the EDB PPAS database instance crashes, the EDB PPAS package fails over to the
adaptive node without any user intervention. The shared data required for EDB PPAS is placed on
the shared storage. Therefore, the EDB PPAS database instance running on the other node accesses
the same data that was accessed by the primary node.
The advantage of placing the EDB PPAS binaries on the local disk is that, if the EDB PPAS binaries
or installation gets corrupted to incomplete or wrong patch, the adaptive node will have its own
EDB PPAS binary that might not have the same issue.
NOTE: HP recommends that you install the EDB PPAS software on the local storage of each node
in the cluster. This avoids single point of failure. HP also recommends that you install the EDB PPAS
software on a file system over the shared disk when there is only one database instance. In such
a case, the volume group and the file system on which the EDB PPAS software binaries are installed
must be configured as part of the database package.
When you deploy multiple EDB PPAS database in a cluster, HP recommends that you install the
EDB PPAS software binaries on the local storage of each node in the cluster. If you select to install
the EDB PPAS software binaries on a shared storage, then each EDB PPAS database must have
its own copy of EDB PPAS software binaries on exclusive shared storage accessible from all the
nodes the database is configured to run.
Supported configuration 5