A virtual storage module operable to run in a virtual machine monitor may include a wait-queue operable to store incoming block-level data requests from one or more virtual machines. In-memory metadata may store information associated with data stored in local persistent storage that is local to a host computer hosting the virtual machines. The data stored in local persistent storage replicates a subset of data in one or more virtual disks provided to the virtual machines. The virtual disks are mapped to remote storage accessible via a network connecting the virtual machines and the remote storage. A cache handling logic may be operable to handle the block-level data requests by obtaining the information in the in-memory metadata and making I/O requests to the local persistent storage or the remote storage or combination of the local persistent storage and the remote storage to service the block-level data requests.

Scalable cloud storage architecture

A network system for a data center is described in which a switch fabric provides full mesh interconnectivity such that any servers may communicate packet data to any other of the servers using any of a number of parallel data paths. Moreover, according to the techniques described herein, edge-positioned access nodes, optical permutation devices and core switches of the switch fabric may be configured and arranged in a way such that the parallel data paths provide single L2/L3 hop, full mesh interconnections between any pairwise combination of the access nodes, even in massive data centers having tens of thousands of servers.

Non-blocking any-to-any data center network with packet spraying over multiple alternate data paths

Methods and structure for improved exibility in managing cache memory in a storage controller (106) of a computing device (104) on which multiple virtual machines (VMs) (110) are operating in a VM computing environment (100). Embodiments hereof provide for the storage controller to receive configuration information from a VM management system (102) coupled with the storage controller where the configuration information comprises information regarding each VM presently operating on the computing device. Based on the configuration information, the storage controller allocates and de-allocates segments (208, 210, 212) of the cache memory of the storage controller for use by the various virtual machines presently operating on the computing device. The configuration information may comprise indicia of the number of VMs presently operating as well as performance metric threshold configuration information to allocate/de-allocate segments based on present performance of each virtual machine.

Methods and structure for improved flexibility in shared storage caching by multiple systems operating as multiple virtual machines

A computer system for managing the execution of threads including at least one central processing unit which performs interleaved execution of a plurality of threads throughout a plurality of virtual processors from said same central processing unit, and a handler for distributing the execution of the threads throughout the virtual processors. The computer system further includes means for classifying threads to be executed according to several predetermined types, and the handler for distributing the execution of threads directs each thread to be executed to a virtual processor according to the type thereof.

System and method for managing the interleaved execution of threads

Network access node virtual fabrics configured dynamically over an underlay network are described A centralized controller, such as a software-defined networking (SDN) controller, of a packet switched network is configured to establish one or more virtual fabrics as overlay networks on top of the physical underlay network of the packet switched network For example, the SDN controller may define multiple sets of two of more access nodes connected to the packet switched network, and the access nodes of a given one of the sets may use a new data transmission protocol, referred to generally herein as a fabric control protocol (FCP), to dynamically setup tunnels as a virtual fabric over the packet switched network The FCP tunnels may include all or a subset of the parallel data paths through the packet switched network between the access nodes for a given virtual fabric

Network access node virtual fabrics configured dynamically over an underlay network

A mechanism is provided in a virtual machine monitor for providing cache partitioning in virtualized environments. The mechanism assigns a virtual identification (ID) to each virtual machine in the virtualized environment. The processing core stores the virtual ID of the virtual machine in a special register. The mechanism also creates an entry for the virtual machine in a partition table. The mechanism may partition a shared cache using a vertical (way) partition and/or a horizontal partition. The entry in the partition table includes a vertical partition control and a horizontal partition control. For each cache access, the virtual machine passes the virtual ID along with the address to the shared cache. If the cache access results in a miss, the shared cache uses the partition table to select a victim cache line for replacement.

Cache Partitioning in Virtualized Environments

Cache partitioning with a partition table to effect allocation of shared cache to virtual machines in virtualized environments

Cache partitioning with a partition table to effect allocation of ways and rows of the cache to virtual machine in virtualized environments

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Cache Partitioning in Virtualized Environments

Cache partitioning with a partition table to effect allocation of shared cache to virtual machines in virtualized environments

Cache partitioning with a partition table to effect allocation of ways and rows of the cache to virtual machine in virtualized environments