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Chapter 23: Special MaintenanceKernel Upgrade The kernel files are: dw1_nnn.CAR dw2_nnn.CARIn this filename, nnn is the patch level (for example, dw1_114.CAR.)4. Unpack the kernel files (see chapter 13, Retrieving files from SAP, SAPSERV4 for theunpacking procedure).5. Back up the system at the database and operating system levels.6. Stop the R/3 System.7. Stop the SAP services that are using the kernel files (NT).8. Backup the kernel directoryNT:UNIX::\usr\sap\\sys\exe\run/usr/sap//sys/exe/runCopy the current kernel files to a backup directory, to be prepared in the event that youneed to restore back to the old version if a problem occurs with the new version.9. Copy the new kernel files into the kernel directoryThis replaces the old programs with the new programs.10. Perform any special instructions contained in: Kernel instructions Online Service System notes Upgrade manual11. Restart.1. Restart the SAP services that are using the kernel files (NT).2. Start the R/3 System3. Check the R/3 logs.4. Monitor the system and system logs for problems.1. Restart the server.2. Check all logs for: Operating system Database3. Start the R/3 System4. Check the R/3 logs5. Monitor the system and system log for problems.System Administration Made Easy23–41