2.4
System Nodes
Each Urika-GX node is a logical grouping of a processor, memory, and a data routing resource. Nodes can be
categorized as compute, I/O, service and login nodes.
Table 1. Node Types and Descriptions
Node Type
Description
Compute nodes
Compute nodes run application programs.
I/O nodes
I/O nodes facilitate connecting to the supported external storage system.
Login nodes
Users log in to the Urika-GX system via login nodes and virtual machines
(VMs). Login nodes store users' local files and facilitate launching jobs from the
command line. They also offer the environment for users to build, compile, and
monitor analytics applications.
Service nodes
Service nodes handle support functions such as user login and I/O.
All Urika-GX nodes run the CentOS operating system (version 7.3) as well as portions of the Cray Linux
Environment (CLE).
2.5
Restrictions on Use
Hardware Considerations
The following items should be kept under consideration when using Urika-GX hardware:
●
High speed network/management network switches must not be modified as this network is internal to Urika-
GX.
●
Moving the system from the rack Cray supplies to customer provided racks is not supported.
●
Sub-rack and SMW hardware configuration must not be changed.
●
PCIe devices should not be modified.
●
Hardware and drivers installed on the SMW and nodes should not be modified.
●
PDUs installed on the system should not be replaced.
Contact Cray Support if it is required to swap nodes between slots. The following options are supported:
●
Connecting to the internal PDU power switches.
●
Changing the hosts names of login nodes and the SMW.
●
The single top of rack switch used for the operational network may be modified to meet site-specific needs.
This switch is expected to be used to enable a direct connection from the site network to the compute and I/O
nodes to support data ingestion and streaming analytics. This network may be modified to reflect site-specific
IP addresses and node names that would be directly exposed to the site network. For information on how to
configure the operational network, contact Cray support.
The Urika-GX System
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