●
The available space in the rack can be used for additional hardware, however proper power and cooling for
that gear needs to be ensured.
Contact Cray Support for information related to:
●
Optionally switching to higher bandwidth NICs on the login nodes or SMW connections to the site network.
●
Changing the internal range of Cray's IP addresses in case there is a conflict.
Software Considerations
The following items should be kept under consideration when using Urika-GX software:
●
Spark Shells using Kubernetes (i.e., those launched under the secure service mode) will be limited to 16
cores and 60 GiB memory and this cannot be overridden at the command line. This is due to a limitation of
the lack of native Spark Shell support in the Spark on Kubernetes project that Cray has provided a
workaround for in this release.
●
Modifying the iSCB firmware is not supported.
●
Modifying switch firmware (both Ethernet/InfiniBand) is not supported.
●
Modifying node BIOS settings is not supported.
●
Modifying the kernel and/or kernel modules is not supported.
●
Deleting any factory installed software is not supported.
●
Changing the default configurations of Mesos, Marathon,
mrun
, and Grafana is not supported.
●
Launching of Docker containers through Docker commands is not supported. Users must use the Marathon
interface for launching containers. For more information, refer to S-3015, "Urika
®
-GX Analytic Applications
Guide".
●
Building and managing new Docker images is currently not supported on Urika-GX. For more information,
contact Cray Support.
Before installing any additional software on the Urika-GX system, a ticket should be opened with Cray Support to
verify that the software will have no impact on the system. The following options are supported:
●
Adding CentOS 7 packages that do not cause dependency issues with the Cray installed software. Only Cray-
provided Linux updates and YUM repositories should be used.
●
Installing additional HDP 2.6.1.0-129 compliant packages and modifying these packages for integrating into
the existing software stack. This applies in the default service mode for HDP related items, except Spark. For
more information, refer to
on page 177
●
Tuning Hadoop and Spark configuration parameters listed in section "Tunable Hadoop and Spark
Configuration Parameters" of S-3015, "Urika
®
-GX Analytic Applications Guide".
NOTE: Contact Cray Support if it is required to modify additional software configurations.
Security Considerations
If the Urika GX system is running in the secure mode in production, Cray does not recommend toggling back to
the default mode while in production because, in the default mode, the security assurances provided by secure
mode are not in place, and the security of data that was protected by secure mode may be compromised while
running in the default mode. Cray cannot extend the secure mode security assurances to any system that has run
in a production state in the default mode until that system has been fully re-deployed.
The following actions are not supported:
The Urika-GX System
S3016
13
