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    Remote direct memory access (RDMA)-based recovery of dirty data in remote memory
    2.
    发明授权
    Remote direct memory access (RDMA)-based recovery of dirty data in remote memory 有权

    公开(公告)号：US11436112B1

    公开(公告)日：2022-09-06

    申请号：US17321673

    申请日：2021-05-17

    申请人： VMware, Inc.

    发明人： Keerthi Kumar ,  Halesh Sadashiv ,  Sairam Veeraswamy ,  Rajesh Venkatasubramanian ,  Kiran Dikshit ,  Kiran Tati

    IPC分类号： G06F11/00 ,  G06F11/20 ,  G06F15/173

    摘要： Techniques for implementing RDMA-based recovery of dirty data in remote memory are provided. In one set of embodiments, upon occurrence of a failure at a first (i.e., source) host system, a second (i.e., failover) host system can allocate a new memory region corresponding to a memory region of the source host system and retrieve a baseline copy of the memory region from a storage backend shared by the source and failover host systems. The failover host system can further populate the new memory region with the baseline copy and retrieve one or more dirty page lists for the memory region from the source host system via RDMA, where the one or more dirty page lists identify memory pages in the memory region that include data updates not present in the baseline copy. For each memory page identified in the one or more dirty page lists, the failover host system can then copy the content of that memory page from the memory region of the source host system to the new memory region via RDMA.

    Efficiently purging non-active blocks in NVM regions using virtblock arrays
    3.
    发明授权
    Efficiently purging non-active blocks in NVM regions using virtblock arrays 有权

    公开(公告)号：US11249900B2

    公开(公告)日：2022-02-15

    申请号：US16174249

    申请日：2018-10-29

    申请人： VMware, Inc.

    发明人： Xavier Deguillard ,  Ishan Banerjee ,  Julien Freche ,  Kiran Tati ,  Preeti Agarwal ,  Rajesh Venkatasubramanian

    IPC分类号： G06F12/00 ,  G06F12/02 ,  G06F12/1009 ,  G06F12/0804

    摘要： Techniques for efficiently purging non-active blocks in an NVM region of an NVM device using virtblocks are provided. In one set of embodiments, a host system can maintain, in the NVM device, a pointer entry (i.e., virtblock entry) for each allocated data block of the NVM region, where page table entries of the NVM region that refer to the allocated data block include pointers to the pointer entry, and where the pointer entry includes a pointer to the allocated data block. The host system can further determine that a subset of the allocated data blocks of the NVM region are non-active blocks and can purge the non-active blocks from the NVM device to a mass storage device, where the purging comprises updating the pointer entry for each non-active block to point to a storage location of the non-active block on the mass storage device.

    High Availability For Persistent Memory
    5.
    发明申请
    High Availability For Persistent Memory 审中-公开

    公开(公告)号：US20200042413A1

    公开(公告)日：2020-02-06

    申请号：US16584857

    申请日：2019-09-26

    申请人： VMware, Inc.

    发明人： Pratap Subrahmanyam ,  Rajesh Venkatasubramanian ,  Kiran Tati ,  Qasim Ali

    IPC分类号： G06F11/20 ,  G06F12/0804 ,  G06F1/30 ,  G06F11/14

    摘要： Techniques for implementing high availability for persistent memory are provided. In one embodiment, a first computer system can detect an alternating current (AC) power loss/cycle event and, in response to the event, can save data in a persistent memory of the first computer system to a memory or storage device that is remote from the first computer system and is accessible by a second computer system. The first computer system can then generate a signal for the second computer system subsequently to initiating or completing the save process, thereby allowing the second computer system to restore the saved data from the memory or storage device into its own persistent memory.