Owners Manual

Dell Integrated Systems for Oracle Database 2.0 - Owner’s Guide 1.1
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provides three additional mirrored copies residing on separate disks on top of the Normal
Redundancy, thus providing a total of six copies.
4.2.4 Disk ownership and permissions setup using UDEV rules
The necessary and appropriate ownership and permissions that is required on the storage
disks before Oracle 12c grid and database installation is preconfigured on the DISOD
database nodes. These appropriate ownership and permissions are set up by using UDEV
rules across all the partitions described in section 4.2.3 Shared storage volume partitions .
UDEV rules are configured in the /etc/udev/rules.d/99-dell.rules file.
4.2.5 Device-Mapper multipath
In order to employ high availability with external storage, this integrated system uses the
Linux Device-Mapper multipath utility. The advantage of using this is that storage traffic is
not only redundant, but is load-balanced across multiple connections, increasing total
throughput. Multipathing is already set up by using recommended best practices of Dell,
with redundancy verified before shipping to the customer. The multipath is configured in
the /etc/multipath.conf file.
4.2.6 Oracle network configuration
The network configuration within the database nodes is designed to provide HA, high
bandwidth, and load balance for both the Oracle database’s public and private
interconnect network traffic. Two dual port, 40 GbE Mellanox PCIe adapters are used, with
one port from each adapter for the public traffic and the other port from each adapter for
the private interconnect traffic. This type of design provides HA at the port and at the
adapter level for both the types of Oracle Database traffic. The two ports across the two
adapters are also connected to two separate ToR switches to further provide redundancy
and load balance at the switch-level, and eliminate any single point of failure in the Oracle
Database network.
The two public network interfaces or ports in each of the database nodes are not
preconfigured. Dell recommends to configure them at the customer site by using native
Oracle Linux bonding driver in active-backup configuration mode. This type of
configuration ensures a failover path is available in case the active public interface loses
connection and prevents any downtime.
NOTE: In the OS, the two public network interfaces are enumerated as eth4 and eth6.
The two private network interfaces are not bonded at the OS level because Oracle
recommends to use the Highly Available IP (HAIP) database feature which places two
separate physical links on different subnets, ensuring that there are two distinct paths for
data to travel on. HAIP is a feature of Oracle Grid Infrastructure installation, and requires at
least two interfaces on separate private subnets to be configured. To help with faster
deployment at the customer site, the two private network interfaces in all the database
nodes are preconfigured in the following OS interface network scripts: