些文章为英文原文文档，主要讲解的是在 Exchange 2013 高可用性中的4个关键的改变，这些改变大大的提升了 Exchange 2013 的性能，在生产环境中 Exchange 的高可用性将会更好的为企业提升效率。
Multiple databases per volume: This lets you have both active and passive databases on the same volume, which is great when you consider the larger disks that Exchange 2013 can handle while still retaining low IOPS due to continued improvements to the information store and Extensible Storage Engine (ESE).
Auto-reseed: If a disk fails and has one or more database copies on it, Exchange can reseed to another spare disk (if available) through the replication service. The service can remap a spare and reseed. If there’s more than one database to reseed, Exchange can do them in parallel.
Lagged copy enhancements: One change is the new Safety Net, which replaces the transport dumpster and provides a similar service of storing copies of messages successfully delivered to the active database of a mailbox server. (You can configure how long Safety Net holds these messages.) Safety Net is taking over the responsibilities of shadow redundancy in a DAG environment in that there is no need to keep another copy of a delivered message in a shadow queue while it waits to be replicated from the active to the passive database. That copy already exists in the Safety Net, so the shadow queue is redundant. One of the best features in Safety Net is the ability to activate a lagged copy: You can toss your transaction logs and mount the copy and let the Safety Net bring that database current.
Site resilience: This is by far my favorite new feature. Many Exchange admins have complained that, in data center failovers, you have to manually intervene and perform a site switchover. Not only does Exchange lack automatic failover between sites that experience a loss of quorum due to WAN outages and so forth, its manual switchover process is frustrating to work through. Exchange 2013 changes that: You can now have an automatic failover of your primary data center. There are some design conditions to take into consideration — such as having three locations (two for Exchange servers and one for your witness server) — but having the possibility of automatic failover is just awesome. If you do the manual switchover,Exchange 2013 reduces the effort to three simple steps.
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自动重新设定种子：如果一个磁盘出现故障，并且磁盘上有一个或多个数据库副本，Exchange可以通过复制服务重新设定到另一个备用磁盘（如果可用）。该服务可以重新映射备用磁盘并重新设定种子。如果有多个数据库需要重新设定种子，Exchange可以并行执行。
每个卷有多个数据库：这使您可以在同一个卷上同时拥有主动和被动数据库，如果您考虑到Exchange 2013可以处理的较大磁盘，同时由于信息存储和可扩展存储引擎（ESE）的不断改进，仍然保持低IOPS，这将是非常好的。