Abstract: In part, in one aspect, the disclosure relates to a first computer system including a first processor and first memory, a first IO storage subsystem including a first switch configured for one or more first storage devices, a first IO non-storage subsystem including a first which configured for one or more first non-storage devices, a second compute system including a second processor and second memory, a second storage IO subsystem including a second switch configured for one or more second storage devices, a second IO non-storage subsystem including a second switch configured for one or more second non-storage devices and a midplane including a power connector, a processor side and an IO side, wherein the processing side includes connectors in electrical communication with the computer systems, the IO side includes connectors in electrical communication with the storage and non-storage subsystems.

Abstract: In part, in one aspect, the disclosure relates to a method of enabling hot plugging operations in a computer system. The method mat include initializing a platform driver, wherein the platform driver is installed on a computer system running an operating system; disabling, using the platform driver, an interrupt function and a hardware detection notification function of the computer system; hot plugging a PCIe node in the computer system; detecting, using the platform driver, the hot plugging of the PCI node in the computer system; configuring the PCIe node, using the platform driver, wherein the configured PCIe node comprises a PCI hierarchy, the PCI hierarchy comprising an allocation of PCI bridges and devices of the configured PCIe node; and bringing the devices of the hot plugged configured PCIe node into service for use by the computing system.

Abstract: In part, the invention relates to a system and method for writing checkpointing data to a computer having a standby virtual machine for each checkpointed component on a computer having an active virtual machine. In one embodiment, the checkpointing data is processed on a per virtual machine basis. This is performed in a way that allows checkpointing data packets from multiple sources to be transferred asynchronously, subsequently reassembled into a coherent checkpoint message, and applied asynchronously.

Abstract: A method of migrating memory from a primary computer to a secondary computer. In one embodiment, the method includes the steps of: (a) waiting for a checkpoint on the primary computer; (b) pausing the primary computer; (c) selecting a group of pages of memory to be transferred to the secondary computer; (d) transferring the selected group of pages of memory and checkpointed data; (e) restarting the primary computer; (f) waiting for a checkpoint on the primary computer; (g) pausing the primary computer; (h) selecting another group of pages of memory to be transferred; (i) transferring the other selected group of pages of memory and data checkpointed since the previous checkpoint to the secondary computer; (j) restarting the primary computer; and (k) repeating steps (f) through (j) until all the memory of the primary computer is transferred.

Abstract: In part, the invention relates to a system and method for writing checkpointing data to a computer having a standby virtual machine for each checkpointed component on a computer having an active virtual machine. In one embodiment, the checkpointing data is processed on a per virtual machine basis. This is performed in a way that allows checkpointing data packets from multiple sources to be transferred asynchronously, subsequently reassembled into a coherent checkpoint message, and applied asynchronously.

Abstract: A system is provided for rapidly synchronizing two or more processing elements in a fault-tolerant computing system. Embodiments of this system allow for the rapid synchronization of two processing elements through partial copies of the contents of memory associate with each processing element.

Abstract: A system is provided for rapidly synchronizing two or more processing elements in a fault-tolerant computing system. Embodiments of this system allow for the rapid synchronization of two processing elements through partial copies of the contents of memory associate with each processing element.

Abstract: A system is provided for rapidly synchronizing two or more processing elements in a fault-tolerant computing system. Embodiments of this system allow for the rapid synchronization of two processing elements through partial copies of the contents of memory associate with each processing element.

Abstract: A system is provided for rapidly synchronizing two or more processing elements in a fault-tolerant computing system. Embodiments of this system allow for the rapid synchronization of two processing elements through partial copies of the contents of memory associate with each processing element.

Abstract: A fault-tolerant computer system comprises a plurality of processing nodes and a plurality of storage nodes interconnected by a network. The processing nodes perform processing operations in connection with user-generated processing requests. The processing nodes, in connection with processing a processing request, generate storage and retrieval requests for transmission to the storage node to enable storage of data thereon and retrieval of data therefrom. The storage nodes store data in at least one replicated partition group comprising a plurality of replicated partitions distributed across the storage nodes. A storage node, on receiving a retrieval request from a processing node provide the requested data to the processing node. In addition, on receiving a storage request from a processing node, a storage node initiates an update operation to update all of the replicated partitions in the replicated partition group.