RECOVERING A VIRTUAL MACHINE AFTER FAILURE OF POST-COPY LIVE MIGRATION

    公开(公告)号:US20210342232A1

    公开(公告)日:2021-11-04

    申请号:US17242508

    申请日:2021-04-28

    IPC分类号: G06F11/14 G06F11/07 G06F11/30

    摘要: Post-copy is one of the two key techniques (besides pre-copy) for live migration of virtual machines in data centers. Post-copy provides deterministic total migration time and low downtime for write-intensive VMs. However, if post-copy migration fails for any reason, the migrating VM is lost because the VM's latest consistent state is split between the source and destination nodes during migration. PostCopyFT provides a new approach to recover a VM after a destination or network failure during post-copy live migration using an efficient reverse incremental checkpointing mechanism. PostCopyFT was implemented and evaluated in the KVM/QEMU platform. Experimental results show that the total migration time of post-copy remains unchanged while maintaining low failover time, downtime, and application performance overhead.

    Adeno-Associated-Virus Rep Sequences, Vectors and Viruses

    公开(公告)号:US20210332331A1

    公开(公告)日:2021-10-28

    申请号:US17167743

    申请日:2021-02-04

    摘要: The invention provides adeno-associated virus (AAV) replication (Rep) sequences. In one embodiment, the invention provides nucleotide sequences encoding a chimeric protein, wherein the encoded chimeric protein contains a wild type AAV Rep inhibitory amino acid sequence, and wherein the nucleotide sequences contain a scrambled and/or deoptimized polynucleotide sequence encoding the wild type AAV Rep inhibitory amino acid sequence. The invention provides vectors, cells, and viruses containing the invention's sequences. Also provided are methods for detecting portions of the AAV Rep inhibitory amino acid sequence, which reduce replication and/or infection and/or productive infection by viruses. The invention's compositions and methods are useful for site-specific integration and/or expression of heterologous sequences by recombinant adeno-associated virus (rAAV) vectors and by rAAV virus particles, such as hybrid viruses (e.g., Ad-AAV) comprising such vectors. The invention's compositions and methods find application in, for example, gene therapy and/or vaccines.

    METHOD FOR AUTOMATED 3D PRINT QUALITY ASSESSMENT AND REDESIGN

    公开(公告)号:US20210325848A1

    公开(公告)日:2021-10-21

    申请号:US17267430

    申请日:2019-08-09

    摘要: Shape diameter-based approaches to identifying and correcting 2D slices of 3D models (or the 3D models themselves) are provided for improved manufacturability. Using the present approaches, critical error-prone regions in 2D slices or 3D models can be identified, including thin extrusions and bridges, sharp corners, small holes, and narrow intrusions. The areas of these regions can be computed and used to quantify the printability of the slices or models. The boundaries of slices or models can be modeled as mass-spring-damper systems for performing local deformations to correct error-prone regions. External forces, that are a function of shape diameters and interior angles, can be imposed on the modeled systems for this purpose.