Important:  Before you attempt any IBM Spectrum Virtualize code update, read and  understand the concurrent compatibility and code cross-reference matrix. For more  information, see the following website and click  Latest IBM Spectrum Virtualize code : http://www.ibm.com/support/docview.wss?uid=ssg1S1001707 During the update, each node in your clustered system is automatically shut down and  restarted by the update process. Because each node in an I/O Group provides an alternative  path to volumes, use the Subsystem Device Driver (SDD) to make sure that all I/O paths  between all hosts and storage area networks (SANs) work.  If you do not perform this check, certain hosts might lose connectivity to their volumes and  experience I/O errors. The software upgrade test utility is a software instruction utility that checks for known issues  that can cause problems during an IBM Spectrum Virtualize software update. More  information about the utility is available at the following website: http://www.ibm.com/support/docview.wss?rs=591&uid=ssg1S4000585 Download the software upgrade test utility from this page (you can also download the  firmware here). This procedure ensures that you get the current version of this utility. You can  use the  svcupgradetest  utility to check for known issues that might cause problems during a  software update.  The software upgrade test utility can be downloaded in advance of the update process.  Alternately, it can be downloaded and run directly during the software update, as guided by  the update wizard. You can run the utility multiple times on the same system to perform a readiness check-in  preparation for a software update. Run this utility for a final time immediately before you apply  the IBM Spectrum Virtualize update to ensure that there were no new releases of the utility  since it was originally downloaded. The installation and use of this utility is nondisruptive, and does not require a restart of any  nodes. Therefore, there is no interruption to host I/O. The utility is installed only on the current  configuration node. System administrators must continue to check whether the version of code that they plan to  install is the latest version. You can obtain the current information at the following website: https://ibm.biz/BdjviZ This utility is intended to supplement rather than duplicate the existing tests that are  performed by the IBM Spectrum Virtualize update procedure (for example, checking for  unfixed errors in the error log). A concurrent software update of all components is supported through the standard Ethernet  management interfaces. However, during the update process, most of the configuration tasks  are restricted. Chapter 13. Reliability, availability, and serviceability, and monitoring and troubleshooting  719 13.4.2 IBM Spectrum Virtualize upgrade test utility