Chapter 6. IBM System x3850 X5 and x3950 X5 297 IBM XIV Storage System: Architecture, Implementation, and Usage, SG24-7659This book describes the concepts, architecture, and implementation of the IBM XIV®Storage System:http://www.redbooks.ibm.com/abstracts/sg247659.html IBM Midrange System Storage Hardware Guide, SG24-7676This book consolidates, in one document, detailed descriptions of the hardwareconfigurations and options offered as part of the IBM Midrange System Storage servers,which include the IBM System Storage DS4000 and DS5000 families of products:http://www.redbooks.ibm.com/abstracts/sg247676.htmlFor more information regarding HBA storage-specific settings and zoning, contact your SANvendor or storage vendor.6.11 Failure detection and recoveryThis section provides an overview of tools available to assist with problem resolution for thex3850 X5 in any given configuration. It also provides considerations for extended outages.6.11.1 What happens when a node fails or the MAX5 failsIf you have power problems and one or both nodes fail or the MAX5 is no longer supplied withpower, the complex configuration will shut down to avoid any damage (data loss, corrupt data,and so on). No OS can handle this sudden change to the system.The MAX5 is turned off only if the connected server issues a power-off request and you havedisconnected the MAX5 power cord from the power source. You cannot turn off the MAX5expansion module manually.For recovery options, see 6.11.4, “Recovery process” on page 299.6.11.2 Reinserting the QPI wrap cards for extended outagesIf one node becomes unavailable for any reason, you have the capability to boot your systemin a single-node configuration. If you have QPI wrap cards, install the QPI cards for yoursystem. The QPI wrap cards are not mandatory, but they provide a performance boost byensuring that all CPUs are only one hop away from each other. For more information aboutQPI cards, see 3.4.2, “QPI Wrap Card” on page 66.For recovery options, see 6.11.4, “Recovery process” on page 299.6.11.3 Tools to aid hardware troubleshooting for x3850 X5Use the following tools when troubleshooting problems on the x3850 x5 in any configuration.Integrated Management ModuleThe first place to start troubleshooting the x3850 X5 is typically the IMM. Use the links underthe Monitors heading to view the status of the server, as shown in Figure 6-81 on page 298.
