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Document generated on: 2017-08-23 (revision: 4713) Table of Contents Preface .............................................................................................................................................. v 1 New Features and Changes ............................................................................................................ 1 1.1 Supported Kernels ................................................................................................................ 1 1.2 Unbreakable Enterprise Kernel Release 2 ............................................................................. 2 1.3 Unbreakable Enterprise Kernel Release 4 ............................................................................. 2 1.4 OpenSCAP .......................................................................................................................... 2 1.5 Load Balancing and High Availability ..................................................................................... 2 1.6 Hyper-V Daemons ................................................................................................................ 2 1.7 Enhanced SSSD Support for Active Directory ........................................................................ 3 1.8 Removing the RHCK from a System ..................................................................................... 3 1.9 Technology Preview Features ............................................................................................... 4 1.9.1 Technology Preview Features in UEK R2 ................................................................... 4 1.9.2 Technology Preview Features in UEK R4 ................................................................... 5 1.9.3 Technology Preview Features in RHCK ...................................................................... 6 2 Fixed and Known Issues ................................................................................................................. 9 2.1 Fixed Issues ....................................................................................................................... 10 2.1.1 dm-cache support .................................................................................................... 10 2.1.2 Kdump Service Can Be Enabled by Using system-config-kdump Under UEK R4 .......... 10 2.2 Known Issues ..................................................................................................................... 10 2.2.1 Btrfs File System Issues on UEK .............................................................................. 10 2.2.2 OFED iSER Feature Causes Out-Of-Memory Error .................................................... 10 2.2.3 Kernel panic when booting the Red Hat Compatible Kernel on a btrfs root partition ....... 10 2.2.4 DTrace Issues ......................................................................................................... 11 2.2.5 Linux Containers (LXC) ............................................................................................ 11 2.2.6 avahi-daemon Fails to Start with UEK R2 ................................................................. 12 2.2.7 Booting UEK R2 as a PVHVM Guest ........................................................................ 12 2.2.8 Console Appears to Hang when Booting ................................................................... 12 2.2.9 Default I/O Scheduler ............................................................................................... 12 2.2.10 Default NFS Mount Options .................................................................................... 12 2.2.11 Default Reverse Path Filtering Mode Affects Certain Oracle Products ........................ 12 2.2.12 Enabling FIPS Mode .............................................................................................. 13 2.2.13 Error message Following First Reboot on an HP ProLiant Server .............................. 13 2.2.14 ext4 Inline Data ..................................................................................................... 14 2.2.15 gcc-libraries Package ............................................................................................. 14 2.2.16 Incorrect Package Count ........................................................................................ 14 2.2.17 Intel TCO Watchdog Timer Messages ..................................................................... 14 2.2.18 Mellanox ConnectX Drivers .................................................................................... 14 2.2.19 mlx4_core Conflicts Between the mlnx_en and ofa Packages ................................... 14 2.2.20 mlx4_ib Insertion Error when RDMA Starts .............................................................. 14 2.2.21 Oracle Clusterware Fails to Start on ASM Storage with SELinux Enabled .................. 15 2.2.22 Oracle RDBMS Server 11gR2 Preinstall Settings Not Visible After Installation ............ 15 2.2.23 Oracle VM 3.0 Guests Crash During Oracle Database Installation ............................. 15 2.2.24 Oracle VM 3.3.1 32-bit Guests with UEK R2 Panic .................................................. 15 2.2.25 Paravirtualized Drivers in a Hardware Virtualized Guest ........................................... 15 2.2.26 RHCK Panics When an ext4 File System Is Defragmented ....................................... 15 2.2.27 sched_yield() Settings for the Completely