3.9 Technology Preview

Features that are currently under technology preview when using UEK R5 are described in Unbreakable Enterprise Kernel: Release Notes for Unbreakable Enterprise Kernel Release 5 Update 2.

For RHCK, the following features are currently under technology preview:

  • Systemd: Importd features for container image imports and exports.

  • File Systems:

    • Block and object storage layouts for parallel NFS (pNFS).

    • DAX (Direct Access) for direct persistent memory mapping from an application. This feature is under technical preview for the ext4 and XFS file systems.

    • OverlayFS remains in technical preview.

  • Kernel:

    • Heterogeneous memory management (HMM).

    • No-IOMMU mode virtual I/O feature.

  • Networking:

    • Cisco VIC InfiniBand kernel driver, which provides similar functionality to RDMA on proprietary Cisco architectures.

    • Single-Root I/O virtualization (SR-IOV) in the qlcnic driver.

    • Cisco proprietary User Space Network Interface Controller in UCM servers provided in the libusnic_verbs driver.

    • Trusted Network Connect included.

  • Storage:

    • Multi-queue I/O scheduling for SCSI (scsi-mq). This functionality is disabled by default.

    • Plug-in for the libStorageMgmt API used for storage array management. The libStorageMgmt API is now supported, but the plug-in is under technology preview.