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    部署Skype for Business Server 2015 数据库SQL 高可用AlwayOn

    原文链接:http://blogs.technet.com/b/uclobby/archive/2015/05/08/deploying-sql-server-alwayson-availability-group-for-skype-for-business-server-2015.aspx Deploying SQL Server AlwaysOn Availability Group for Skype for Business Server 2015      In Lync Server 2013, there were requests regarding an alternative to SQL Mirroring for SQL Server High Availability. This was related to the fact that SQL Mirroring was marked as a feature to be removed in future SQL Server versions: This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use AlwaysOn Availability Groups instead. in SQL Server 2014 - Database Mirroring (SQL Server) - https://msdn.microsoft.com/en-us/library/ms189852.aspx In Lync Server 2013, it was common to have SQL Server High Availability using SQL Mirroring. The reason for this was that Topology Builder did all the hard work for us. Another supported scenario was to use SQL failover clustering, but in this case we need to manually deploy it: Database software support in Lync Server 2013 https://technet.microsoft.com/en-us/library/gg398990.aspx The good news is Skype for Business Server 2015 comes with AlwaysOn Availability Groups:

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    Windows Server群集节点和资源监视

    如果将群集资源类比为鸡蛋,那么群集节点类似于装有鸡蛋的篮子,篮子本身的完整决定着里面所装的鸡蛋的安全性。群集节点首先要决定自己是否存活,所以群集节点之间定期使用心跳来判断所有群集节点是否处于健康状态。群集的可用性目标因提供的服务的要求而异,不同服务等级要求的应用对故障恢复时间要求也不同,对健康检测严格要求也不同。同理,可用性要求越高的服务,对检测节点故障和采取后续行动进行恢复的速度越快,可用性要求不高的服务,对于故障恢复时间的容忍也相对要长。鉴于此,Windows Server群集初始具有两类严格程度不同的默认检测策略:

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