Manager configuration. This validation prevents a compute node from
communicating with another compute node outside its partition.
Based on your requirements, you can create additional partitions as follows:
• Create a unique partition for Exalogic's private InfiniBand fabric by setting
nondefault partition keys.
This scenario applies to both single rack and multiple Exalogic racks.
• Create Virtual LANs (VLANs) on the client access network for EoIB configuration
by specifying nondefault partition keys.
VLAN tagging for a virtual network interface (VNIC) on the EoIB network is
optional.
16.2 Understand Partition Keys
A partition key (pkey) is a unique ID assigned to an InfiniBand partition. The pkey of
the default partition is 0x7fff. When a pkey is created, it is a 15-bit number. After the
membership type is set, the pkey value becomes a 16-bit number. The Most Significant
Bit (MSB) of the 16-bit pkey value denotes the membership type. A limited member
has a value of 0, and a full member has a value of 1.
A full member can communicate with both full and limited members of the partition.
However, a limited member can only communicate with a full member.
When assigning a pkey value for a unique, nondefault partition, you should select a
15-bit value. For example, 0x1234 with values from 0x0001 to 0x7fff. A total of
32767 pkeys are available. Do not assign pkeys that differ only in the MSB of their 16-
bit numbers (for example, 0x8005 and 0x0005).
16.2.1 Guidelines for Managing pkey Allocation in a Hybrid Rack
The term hybrid rack denotes an Exalogic machine on which half the compute nodes
are in a physical configuration and the other half constitutes a virtualized data center.
For more information about hybrid racks, see the Exalogic Elastic Cloud Release Notes.
On a hybrid Exalogic rack, Exalogic Control ensures that a unique pkey is assigned to
each partition in the virtual environment. However, in the physical half of the rack,
pkeys continue to be assigned manually, typically by the network administrator. The
following guidelines will help ensure that the pkeys assigned manually to the
partitions created in the physical half of a hybrid rack are different from those that
Exalogic Control assigns automatically to partitions created in the virtual half of the
rack.
1. Make a list (say, L1) of all the pkeys assigned to partitions that were created
before the rack was converted to a hybrid configuration.
This set includes the pkey for the IPoIB-default partition (0x7fff) and pkeys for
any nondefault partitions that were created in the physical configuration. Note
that these pkeys are not guaranteed to be sequential, because they are assigned
manually by administrators, who may be using different conventions for
assigning pkeys to partitions. For example, for EoIB partitions, some
administrators may follow the convention of assigning pkey values that match the
VLAN IDs used for the EoIB networks.
2.
Identify a list (say, L2) of pkeys to be assigned to partitions created in the physical
half of the hybrid rack.
Understand Partition Keys
16-2 Oracle Exalogic Elastic Cloud Machine Owner's Guide
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