Grid Infrastructure Installation and Upgrade Guide Configuring Operating Systems for Oracle Grid Infrastructure on Linux 4 Configuring Operating Systems for Oracle Grid Infrastructure on Linux Complete operating system configuration requirements and checks for Linux operating systems before you start installation. Guidelines for Linux Operating System InstallationOperating system guidelines to be aware of before proceeding with an Oracle installation. Reviewing Operating System and Software Upgrade Best PracticesThese topics provide general planning guidelines and platform-specific information about upgrades and migration. Reviewing Operating System Security Common PracticesSecure operating systems are an important basis for general system security. About Installation Fixup ScriptsOracle Universal Installer detects when the minimum requirements for an installation are not met, and creates shell scripts, called fixup scripts, to finish incomplete system configuration steps. About Operating System RequirementsDepending on the products that you intend to install, verify that you have the required operating system kernel and packages installed. Operating System Requirements for x86-64 Linux PlatformsThe Linux distributions and packages listed in this section are supported for this release on x86-64. Additional Drivers and Software Packages for LinuxInformation about optional drivers and software packages. Checking Kernel and Package Requirements for LinuxVerify your kernel and packages to see if they meet minimum requirements for installation. Installing the cvuqdisk RPM for LinuxIf you do not use an Oracle Preinstallation RPM, and you want to use the Cluster Verification Utility, then you must install the cvuqdisk RPM. Reviewing HugePages Memory AllocationReview this information if your operating system has HugePages enabled. Disabling Transparent HugePagesOracle recommends that you disable Transparent HugePages before you start installation. Enabling the Name Service Cache DaemonTo allow Oracle Clusterware to better tolerate network failures with NAS devices or NFS mounts, enable the Name Service Cache Daemon (nscd). Verifying the Disk I/O Scheduler on LinuxFor best performance for Oracle ASM, Oracle recommends that you use the Deadline I/O Scheduler. Using Automatic SSH Configuration During InstallationTo install Oracle software, configure secure shell (SSH) connectivity between all cluster member nodes. Setting Network Time Protocol for Cluster Time SynchronizationUse either the Oracle Cluster Time Synchronization or network time protocol (NTP) option for time synchronization.