建立一个无显示器、低功耗的备用系统。
你要对自己的备用系统有信心。
应该通过高可用性灾难恢复配置一个备用系统吗？
Should you configure a standby system through high-availability disaster recovery?
数据一致性是主备用系统必须解决的问题。
Data coherence problem must be solved in the host-standby system.
备用系统收到日志写后，将确认通知发送到主系统。
Once the standby system receives the log write, it sends acknowledgements to the primary.
图5演示了同步主系统和备用系统的HADR过程。
Figure 5 illustrates the HADR processes synchronizing a primary and standby system.
您计划从一个冷系统和还原着手，还是从一个预加载的备用系统着手？
Do you plan to start with a cold system and restore, or a preloaded standby system?
主系统执行所有事务性工作，并将任何数据库更改复制到备用系统。
The primary system performs all transactional work and replicates any database changes to the standby.
不间断电源(ups)在系统突然断电时，可充当关键的备用系统。
Uninterruptible power source (UPS) systems serve as critical redundant systems in case of power outages.
当出现故障时，通过一个命令将备用系统的角色切换为主系统的角色。
In the event of a failure, the standby's role can be switched to primary with a single command.
HADR复制数据的基本方法是将DB 2日志写同时发送到本地磁盘和备用系统。
The basic method by which HADR replicates data is to send DB2 log writes simultaneously to the local disk and to the standby system.
利用可编程序调节器的选择控制功能，方便可靠地实现备用系统的软切换。
Utilize the functions of select control. Have fulfilled, conveniently and securely, the soft transfer in reserve system.
“你看，这太棒了，”他说，“飞船上的一切设备运转良好，我们甚至用不到备用系统。”
"You know, it's amazing," he said. "Everything on the spacecraft works, and we're not using any backup systems."
供水中断将是灾难性的，因此必须确保供水系统有足够的贮存能力和备用系统。
Adequate storage capacity and backup systems for all water supplies must be ensured, because interruptions in the water supply may be disastrous.
通常，执行本地写IO的同步操作大于通过TCP/IP传输到备用系统的数据量。
Often the simultaneous operation of performing the local write IO is greater than the transfer of data over TCP/IP to the standby.
应用程序可移回主系统，但最好等到应用程序首先完成备用系统的积压工作再移动。
Apps can be moved back to the primary, but it is best to wait until the apply program gets through the standby's backlog first.
典型示例是灾难恢复测试，其中涉及故障转移到热备用系统、测试应用程序，然后退回到主系统。
The classic example is a disaster recovery test, which involves failing over to a warm standby system, testing the applications, and then failing back to the primary systems.
复制将在更新后的应用程序到达备用系统时立即开始排队更改后的数据，以备恢复主站点。
Replication will begin queuing changed data for return of the primary site as soon as the updated apps hit the standby system.
一个DB 2HADR场景由两个DB 2系统组成，一个是主系统，一个是备用系统。
A DB2 HADR scenario consists of two DB2 systems, a primary and a standby.
信息如潮水般地涌入，造成巴克莱一个交易系 统的崩溃，不过一个备用系统在未中断该公司交易的情况下开始工作。
The flood crashed a Barclays trading system, though a backup system went online without interrupting the firm's trading.
默认的复制方法(也有其他可用的方法)只要求在将确认通知返回给主系统之前，备用系统的内存中收到一个日志写。
The default replication method (others are available) only requires that a log write be received in memory at the standby before acknowledgement is returned to the primary.
首先有一个主冷却系统，然后有一个备用系统，备用系统还有一个备用系统，再有一个备用系统的备用系统，如此下去。
There's the main cooling system, a backup to it, a backup to the backup, a backup to the backup to the backup, and so on.
大部分支持VIP的交换机也能支持主用系统或备用系统的策略，以便流量跑到主用系统那里，除非它不可用或验证失败。
Most switches that support a VIP can also support a policy of primary system or secondary system, so that traffic goes to the primary system unless it is unavailable or fails the validation.
每个代理实例都嵌入到一个WebSphereMQ服务中，以便当队列管理器切换到备用系统时，代理自动在备用节点上启动。
Each broker instance is embedded into a WebSphere MQ service so that, when the queue manager switches over to the standby system, the broker is automatically started on the standby node.
等到连接恢复时，就可以重新打开HADR，而备用系统将与主系统通信，并执行“catch - up”操作，直到它返回到同步状态。
Once connectivity is restored, you can turn HADR back on and the standby will communicate with the primary and perform "catch-up" operations until it returns to a synchronized state.
然后可以将氢气输入到存储系统中，并在需要附加或备用电源时用于发电。
The hydrogen gas could then be fed into a storage system and used to generate electricity when additional or backup power is needed.
在风能不稳定的一些地区，需要供电事业公司或者能量储存系统来提供备用电能。
In areas where the wind dies down, backup electricity from a utility company or from an energy storage system becomes necessary.
如果总管理系统上有足够的备用容量的话，就会用所需的数量来引导——而不是用最小数量。
If there is enough spare capacity on the total managed system, it will boot up with the Desired — not the minimum.
如果总管理系统上有足够的备用容量的话，就会用所需的数量来引导——而不是用最小数量。
If there is enough spare capacity on the total managed system, it will boot up with the Desired — not the minimum.
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