Linux 5.5+ Development
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GRUB Now Supports Btrfs 3/4-Copy RAID1 Profiles (RAID1C3 / RAID1C4 On Linux 5.5+)
When it comes to the storage/file-system changes with the in-development Linux 5.5 kernel one of the most prominent end-user-facing changes is more robust RAID1 for Btrfs with the ability to have three or four copies of the data rather than just two copies, should data safety be of utmost importance and concerned over the possibility of two disks in an array failing.
The Btrfs "RAID1C3" mode was merged last week for this three/four-copy RAID1 while now the GRUB boot-loader has adapted support for these new profiles in order to be able to boot to said arrays.
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Linux 5.5 Adds NFS Client Support For Cross-Device Offloaded Copies (Server To Server)
With NFSv4.2 is the server-side copy (SSC) functionality with the Linux 5.5 kernel's NFS client-side support for that support in allowing "inter" copy offloads between different NFS servers.
This support allows for server-to-server efficient file copies with NFSv4.2 SSC rather than first having to copy to the client system. The NFS client changes also introduce new RDMA tracepoints for debugging congestion control and various other fixes.
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Linux 5.5 KVM Adds POWER Support For Secure Guests/VMs
IBM's work from over a year ago in working towards secure virtual machines on POWER hardware is finally coming to fruition with Linux 5.5 due out early next year.
After those original Secure Virtual Machine POWER9 patches were posted last year, the ultravisor / secure bits landed in Linux 5.4 in preparing the foundation. As explained in that earlier article, "The Ultravisor / SVM support is part of IBM's approach for protected computing that is akin to the approaches of Intel SGX and AMD Secure Encrypted Virtualization (SEV). IBM's Ultravisor code runs with higher privileges than the virtualization hypervisor and in turn the virtual machines rely upon IBM Protected Execution for verifying the behavior of the hypervisor/ultravisor."
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