第三个选项是OG内存到内存解决方案。
SipSession复制只能使用内存到内存复制。
SipSession replication only can use the memory to memory replication.
与处理器的速度相比，这种内存到内存的复制相对比较慢。
This memory to memory copy is relatively slow compared to the speed of the processor.
DRS内存到内存解决方案是适用于很多部署的解决方案。
The DRS memory to memory solution is a good solution for many deployments.
用户既可以选择数据库库持久性，也可以选择内存到内存持久性。
Users can choose either database persistence or memory-to-memory persistence.
问：我应该使用数据库还是使用内存到内存复制来进行会话故障转移？
Q: Should I use a database or memory-to-memory replication for session failover?
您可以为运行在集群中的应用程序选择数据库会话持久化或内存到内存的会话复制。
You can choose from database session persistence or memory-to-memory session replication for applications running in a cluster.
在不考虑数据库运行所需的额外硬件的情况下，数据库持久性的性能也好于内存到内存复制。
The performance of database persistence is also better than memory to memory replication, when not taking the extra hardware that the database is running on into account.
这些服务是DynaCache、内存到内存会话复制、核心组、Web服务缓存和有状态会话Bean持久性。
Those services are DynaCache, memory to memory session replication, core groups, Web services caching, and stateful session bean persistence.
此解决方案的另一个优势是能够处理应用服务器的级联故障，而这在内存到内存配置中只有使用多个副本才有可能实现。
Another advantage is that this solution can handle cascading failures of application servers, which is only possible with more than one replica in a memory to memory configuration.
这些服务是DynaCache、内存到内存会话复制、核心组、Web 服务缓存和有状态会话bean持久化。
Those services are DynaCache, memory-to-memory session replication, core groups, Web services caching, and stateful session bean persistence.
集群的“CreatingaReplicationDomain”选项将启用集群成员之间的内存到内存复制。
'Creating a replication Domain' option for the cluster will enable memory-to-memory replication between cluster members.
另一方面，消息缓冲可能是代价高昂的，因为它需要额外的“内存到内存”的拷贝操作，同时它还需要申请用于缓冲的存储区。
On the other hand, message buffering can be expensive, as it entails additional memory-to-memory copying, and it requires the allocation of memory for buffering.
虚拟内存到物理内存的映射通过页表完成，这是在底层软件中实现的(见图1)。
The mapping of virtual memory to physical memory occurs through page tables, which are implemented in the underlying hardware (see Figure 1).
一个进程分配内存时，它是这样进行的：首先，预定虚拟内存；然后，提交内存到该块中(这是实际使用的内存)。
When a process allocates memory it does so by first reserving virtual memory and then committing memory out of this chunk (this is the memory actually used).
当你最小化火狐时，它会把部分内存转存到虚拟内存中。
When you minimize Firefox,it will send Firefox to your virtual memory and free up your physicalmemory for other programs to use.
当你最小化火狐时，它会把部分内存转存到虚拟内存中。
When you minimize Firefox,it will send Firefox to your virtual memory and free up your physicalmemory for other programs to use.
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