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    • 4. 发明申请
    • Policy-based, cluster-application-defined quorum with generic support interface for cluster managers in a shared storage environment
    • 基于策略的集群应用程序定义的仲裁,具有用于共享存储环境中的集群管理器的通用支持接口
    • US20070016822A1
    • 2007-01-18
    • US11182469
    • 2005-07-15
    • Sudhir RaoBruce JacksonSoumitra Sarkar
    • Sudhir RaoBruce JacksonSoumitra Sarkar
    • G06F11/00
    • G06F9/5061G06F11/1425G06F2209/505H04L67/1002H04L67/1008H04L67/322
    • A system, method and computer program product for use in a server cluster having plural server nodes implementing a server tier in a client-server computing architecture in order to determine which of two or more partitioned server subgroups has a quorum. A determination is made of relative priorities of the subgroups and a quorum is awarded to the subgroup having a highest relative priority. The relative priorities are determined by policy rules that evaluate comparative server node application state information. The server node application state information may include one or more of client connectivity, application priority, resource connectivity, processing capability, memory availability, and input/output resource availability, etc. The policy rules evaluate the application state information for each subgroup and can assign different weights to different types of application state information. An interface may be provided for receiving policy rules specified by a cluster application.
    • 一种在服务器集群中使用的系统,方法和计算机程序产品,其具有在客户端 - 服务器计算架构中实现服务器层的多个服务器节点,以便确定两个或更多个分区服务器子组中的哪一个具有仲裁。 确定子组的相对优先级,并且向具有最高相对优先级的子组授予法定人数。 相对优先级由评估比较服务器节点应用状态信息的策略规则确定。 服务器节点应用状态信息可以包括客户端连接,应用优先级,资源连接性,处理能力,存储器可用性和输入/输出资源可用性等中的一个或多个。策略规则评估每个子组的应用状态信息并且可以分配 不同权重的不同类型的应用状态信息。 可以提供用于接收由集群应用指定的策略规则的接口。
    • 5. 发明授权
    • Method to improve diversity gain in a cooperative spectrum sensing network
    • 提高合作频谱感知网络分集增益的方法
    • US08135424B2
    • 2012-03-13
    • US12327543
    • 2008-12-03
    • Yadunandana N. RaoApoorv ChaudhriSudhir Rao
    • Yadunandana N. RaoApoorv ChaudhriSudhir Rao
    • H04B7/00H04B15/00
    • H04B7/0452H04W72/02
    • A cooperative sensing technique (300) operates by selecting a group of subscribers (302) from a secondary system, measuring a cooperative sensing metric (306) and then using the metric to identify an achievable spatial diversity gain for the group of selected subscribers (308). Once an achievable spatial diversity gain is determined for the group (308/412), it is compared to a required spatial diversity gain (310), and if the condition is met at (310), the validated group can begin spectrum sensing (314) to identify a vacant/suitable channel for operation. If the achievable spatial diversity gain is insufficient, then a new group of users is selected (312) within the secondary system and the process repeats itself.
    • 协作感测技术(300)通过从次系统选择一组订户(302)来操作,测量协作感测度量(306),然后使用度量来识别所选择的用户组(308)的可实现的空间分集增益 )。 一旦为组确定可实现的空间分集增益(308/412),则将其与所需的空间分集增益(310)进行比较,如果在(310)满足条件,则验证组可以开始频谱感测(314 )来确定一个空的/合适的操作通道。 如果可实现的空间分集增益不足,则在辅助系统内选择一组新的用户(312),并且该过程重复。
    • 6. 发明申请
    • Fault tolerant rolling software upgrade in a cluster
    • 集群容错滚动软件升级
    • US20060294413A1
    • 2006-12-28
    • US11168858
    • 2005-06-28
    • Frank FilzBruce JacksonSudhir Rao
    • Frank FilzBruce JacksonSudhir Rao
    • G06F11/00
    • G06F11/1433G06F8/65H04L67/1097H04L67/34H04L69/40
    • A method and system are provided for conducting a cluster software version upgrade in a fault tolerant and highly available manner. There are two phases to the upgrade. The first phase is an upgrade of the software binaries of each individual member of the cluster, while remaining cluster members remain online. Completion of the first phase is a pre-requisite to entry into the second phase. Upon completion of the first phase, a coordinated cluster transition is performed during which the cluster coordination component performs any required upgrade to its own protocols and data structures and drives all other software components through the component specific upgrade. After all software components complete their upgrades and any required data conversion, the cluster software upgrade is complete. A shared version control record is provided to manage transition of the cluster members through the cluster software component upgrade.
    • 提供了以容错和高可用性方式进行集群软件版本升级的方法和系统。 升级有两个阶段。 第一阶段是升级群集中每个成员的软件二进制文件,而剩余的群集成员保持在线状态。 完成第一阶段是进入第二阶段的先决条件。 在第一阶段完成后,执行协调的集群转换,在此期间,集群协调组件执行任何所需的升级到其自身的协议和数据结构,并通过组件特定升级驱动所有其他软件组件。 所有软件组件完成升级和任何所需的数据转换后,集群软件升级完成。 提供共享版本控制记录,以管理集群成员通过集群软件组件升级的转换。
    • 7. 发明申请
    • METHOD TO IMPROVE DIVERSITY GAIN IN A COOPERATIVE SPECTRUM SENSING NETWORK
    • 提高合作频谱感知网络中多样性增益的方法
    • US20100137014A1
    • 2010-06-03
    • US12327543
    • 2008-12-03
    • Yadunandana N. RaoApoorv ChaudhriSudhir Rao
    • Yadunandana N. RaoApoorv ChaudhriSudhir Rao
    • H04B7/00
    • H04B7/0452H04W72/02
    • A cooperative sensing technique (300) operates by selecting a group of subscribers (302) from a secondary system, measuring a cooperative sensing metric (306) and then using the metric to identify an achievable spatial diversity gain for the group of selected subscribers (308). Once an achievable spatial diversity gain is determined for the group (308/412), it is compared to a required spatial diversity gain (310), and if the condition is met at (310), the validated group can begin spectrum sensing (314) to identify a vacant/suitable channel for operation. If the achievable spatial diversity gain is insufficient, then a new group of users is selected (312) within the secondary system and the process repeats itself.
    • 协作感测技术(300)通过从次系统选择一组订户(302)来操作,测量协作感测度量(306),然后使用度量来识别所选择的用户组(308)的可实现的空间分集增益 )。 一旦为组确定可实现的空间分集增益(308/412),则将其与所需的空间分集增益(310)进行比较,如果在(310)满足条件,则验证组可以开始频谱感测(314 )来确定一个空的/合适的操作通道。 如果可实现的空间分集增益不足,则在辅助系统内选择一组新的用户(312),并且该过程重复。
    • 9. 发明申请
    • Apparatus, system, and method for cache synchronization
    • 用于缓存同步的装置,系统和方法
    • US20060106890A1
    • 2006-05-18
    • US10989664
    • 2004-11-16
    • Vipul PaulScott PiperSudhir Rao
    • Vipul PaulScott PiperSudhir Rao
    • G06F12/00G06F17/30
    • G06F12/0815
    • An apparatus, system, and method are disclosed for cache synchronization within a multi-tier system having multiple client-server relationships. The apparatus includes a pre-synchronization module, a locking module, and a synchronization module. The pre-synchronization module receives a pre-synchronization call from an upstream node coupled to a first downstream node. The locking module locks a first cache coupled to the first downstream node in response to a synchronization call from the upstream node. The synchronization module synchronizes source data on the upstream node with cached data on the first cache. The apparatus also may include a post-synchronization module to perform any necessary cleanup activities. Advantageously, the apparatus, system, and method reduce the likelihood of a system deadlock due to premature locking of the first downstream cache, which prevents a subsequent downstream cache from synchronizing with the first cache.
    • 公开了一种用于具有多个客户机 - 服务器关系的多层系统中的高速缓存同步的装置,系统和方法。 该装置包括预同步模块,锁定模块和同步模块。 预同步模块从耦合到第一下游节点的上游节点接收预同步呼叫。 响应于来自上游节点的同步调用,锁定模块锁定耦合到第一下游节点的第一高速缓存。 同步模块将上游节点上的源数据与第一个缓存上的缓存数据进行同步。 该装置还可以包括执行任何必要的清除活动的后同步模块。 有利地,装置,系统和方法减少了由于第一下游高速缓存的过早锁定而导致的系统死锁的可能性,这阻止随后的下游高速缓存与第一高速缓存同步。
    • 10. 发明申请
    • Method, apparatus and program storage device for providing failover for high availability in an N-way shared-nothing cluster system
    • 用于在N路无共享集群系统中为高可用性提供故障切换的方法,装置和程序存储设备
    • US20050283658A1
    • 2005-12-22
    • US10850749
    • 2004-05-21
    • Thomas ClarkAustin D'CostaSudhir RaoJames Seeger
    • Thomas ClarkAustin D'CostaSudhir RaoJames Seeger
    • G06F11/00
    • G06F11/2048G06F11/1482G06F11/2025G06F11/2028G06F11/203G06F11/2046
    • A method, apparatus and program storage device for providing failover for continuous or near-continuous availability in an N-way logical shared-nothing cluster system is disclosed. Cluster application data space partitions are assigned to each node in the cluster and each node's or server software's internal architecture is partitioned in accordance with the application data partitions assigned to the node. Cluster-integrity protection is performed. A failover and recovery protocol is performed based upon the assigned partitions and the partitioned and bound internal architecture. Containment of the impact of failure is provided such that most of the application data space partitions are not impacted. Affected partition sets are failed over fast and in constant time and so actual load on the surviving nodes does not affect failover duration. When shared storage is not provided, synchronous log replication may be used to facilitate failover and log-based recovery.
    • 公开了一种用于在N路逻辑无共享集群系统中提供连续或近连续可用性的故障转移的方法,装置和程序存储设备。 集群应用数据空间分区分配给集群中的每个节点,并且每个节点或服务器软件的内部架构根据分配给节点的应用程序数据分区进行分区。 执行集群完整性保护。 基于分配的分区和分区和绑定的内部架构来执行故障转移和恢复协议。 提供了对故障影响的控制,使得大多数应用数据空间分区不受影响。 受影响的分区集在快速和恒定的时间内故障,因此幸存节点上的实际负载不会影响故障转移持续时间。 当不提供共享存储时,可以使用同步日志复制来促进故障转移和基于日志的恢复。