Modify an Installed SystemConfigure Boot Node FailoverConfigure a tier1 service node to be a backup boot node for boot node failover.Perform Boot Node FailbackBring a failed primary boot node online as the new backup boot node without doing a full system boot.Disable Boot Node FailoverWhile the CLE system is shut down, disable boot node failover by changing settings in several config services (cray_multipath, cray_node_groups, and cray_net), halting both the primary and backup boot nodes, and then updating the default boot configuration, STONITH settings, and NIMS information.Configure SDB Node FailoverConfigure a tier1 service node to be a backup SDB node for SDB node failover.Perform SDB Node FailbackBring a failed primary SDB node online as the new backup SDB node without doing a full system boot.Disable SDB Node FailoverWhile the CLE system is shut down, disable SDB node failover by changing settings in several config services (cray_multipath, cray_node_groups, and cray_net), halting both the primary and backup SDB nodes, and then updating the default boot configuration, STONITH settings, and NIMS information.Rename a NIMS MapThe cmap command does not have the ability to rename a NIMS map, but this procedure shows how to achieve the same result.Set Up Basic Realm-Specific IP ConfigurationDescribes how to edit the configuration worksheet for the Cray RSIP (realm-specific IP) service.Set Up Advanced RSIP Configuration on a Booted SystemTo set up more complex RSIP configuration (e.g., RSIP failover, RSIP pools) on a booted system, use the xtrsipcfg_v2 script to generate RSIP configuration files.Configure a VLAN, Bonded, or Bonded VLAN InterfaceUse the configurator interactively to configure a VLAN, bonded, or bonded VLAN interface on a new or existing host.Configure Cray NAT ServiceThe Cray NAT service can be used to enable network access outside the HSN for nodes without interfaces on the external network.The Node ARP Management Daemon (rca_arpd)Create Logical Machines for Cray XC Series SystemsIntroduction to logical machines.Configure a Logical MachineAbout the xtcli part_cfg command.Boot a Logical MachineAbout the xtbootsys command.Boot the System Using Another SnapshotSpecify a different system snapshot with which to boot a system. Typically, this procedure is used for system rollbacks.Enable Write Cache on SMW Boot RAID VolumeCray SMW boot RAID storage has write cache disabled by default to reduce risk to data integrity. If high write rates are reducing performance and data integrity mitigations are in place, sites can use this procedure to enable write cache on selected storage volumes.Disable NetApp Remote AccessDisable NetApp Remote Access.Configure an NFS client to Mount the Exported Lustre File SystemConfigure an NFS client to mount the exported Lustre file system on CLE.Define Bind Mount Points Within a Config SetHow to persist bind points within a config set.Enable Multipath on an Installed XC SystemIt is preferable to enable multipath during a fresh install, but if a site wants to enable multipath on a system that is already installed, use this procedure.Change Lustre VersionsHow to change Lustre versions for CLE 6.x systems.Install Third-Party Software with a Custom Image RecipeCreate a customized image recipe for Cray nodes that includes third-party software, with a Cray-provided recipe as a subrecipe. Also summarizes other image-creation methods (cloning an image; using zypper/chroot).Remove an Undesired RPM After Building From a Cray RecipeModify a site recipe with zypper or RPM commands to remove an RPM from a recipe.Configure a MOM Node Like a Login NodeRepurpose a Compute or Service NodeCray recommends using repurposed compute nodes as tier2 servers. This procedure describes how to repurpose a compute node as a service node (and vice-versa).Configure Service Node MAMUIntroduces the service node MAMU feature and its limitations. Reconfigure SSD-endowed Compute Nodes DynamicallyThis procedure shows how to dynamically reconfigure SSD-endowed compute nodes (e.g., KNL nodes, which have Intel® Xeon Phi™ "Knights Landing" processors) using the capmc utility. When rebooted, the hardware inventory on the SDB node is updated.Node AttributesIntroduction to node attributes.View and Temporarily Set Node AttributesAbout the xtprocadmin command.The XTAdmin Database segment TableApply Rolling Patches to Compute Nodes with cnatApply qualified compute node patches without having to do a system reboot. Apply Live Updates to NodesApply qualified node patches using actions from package managers, such as zypper and yum, on nodes using repositories shared from the SMW.Update the Physical System Configuration While the System is BootedState Manager LLM LoggingBoot Manager LLM LoggingConfigure Node Health Checker TestsList of NHC tests and configuration file description.Prevent Inaccessible Compute Nodes due to Very High Memory UsageUnder rare circumstances, compute nodes can become inaccessible to the root user due to the OOM killer not intervening when it should. Avoid this situation by changing the kernel's memory overcommittment behavior to match that of earlier kernels.Related conceptsAbout XC Series System Administration Guide (S-2393)About the Cray Management SystemManage the SystemManage System AccessMonitor the System