Debian Handbook/12_advanced-administration — Chinese (Simplified) @ Hosted Weblate: <primary>backup</primary>

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	English	Chinese (Simplified)	Actions
	<primary>spare disk</primary>	<primary>预设值</primary>
	RAID levels that include redundancy allow assigning more disks than required to an array. The extra disks are used as spares when one of the main disks fails. For instance, in a mirror of two disks plus one spare, if one of the first two disks fails, the kernel will automatically (and immediately) reconstruct the mirror using the spare disk, so that redundancy stays assured after the reconstruction time. This can be used as another kind of safeguard for critical data.	包含冗余的 RAID 级别允许为阵列分配比所需更多的磁盘。当其中一个主磁盘发生故障时，多余的磁盘用作备用磁盘。例如，在两个磁盘加一个备用磁盘的镜像中，如果前两个磁盘中的一个发生故障，内核将自动（并立即）使用备用磁盘重建镜像，以便冗余在重建后保持可用。这可用作关键数据的另一种保护。
	One would be forgiven for wondering how this is better than simply mirroring on three disks to start with. The advantage of the “spare disk” configuration is that the spare disk can be shared across several RAID volumes. For instance, one can have three mirrored volumes, with redundancy assured even in the event of one disk failure, with only seven disks (three pairs, plus one shared spare), instead of the nine disks that would be required by three triplets.	人们可能想知道，这怎么比简单地使用三个磁盘镜像开始更好呢。"备用磁盘"配置的优点是，备用磁盘可以在多个 RAID 卷之间共享。例如，有3个镜像卷，即使在一个磁盘发生故障时，也可以有冗余保证，只要7个磁盘（3对，外加一个共享备用磁盘），而不是3组3个共需要9个磁盘。
	This RAID level, although expensive (since only half of the physical storage space, at best, is useful), is widely used in practice. It is simple to understand, and it allows very simple backups: since both disks have identical contents, one of them can be temporarily extracted with no impact on the working system. Read performance is often increased since the kernel can read half of the data on each disk in parallel, while write performance isn't too severely degraded. In case of a RAID-1 array of N disks, the data stays available even with N-1 disk failures.	此 RAID 级别虽然昂贵（因为最多只有物理存储空间的一半可用），但在实践中被广泛使用。它易于理解，允许非常简单的备份：由于两个磁盘具有相同的内容，可以暂时提取其中一个磁盘，对工作系统没有任何影响。读取性能通常提高，因为内核可以并行读取每个磁盘上一半的数据，而写入性能不会严重下降。如果 RAID-1 阵列包含 N 个磁盘，即使 N-1 磁盘发生故障，数据也保持可用。
	<emphasis>CAUTION</emphasis> RAID is not Backup	<emphasis>技巧</emphasis> RAID、磁盘和分区
	<primary>backup</primary>	<primary>debian-cd</primary>
	RAID systems are not backup mechanisms. While RAID increases the redundancy - and therefore the availability of a system - and protects against disk failures, backups are done to protect data from being altered, deleted, getting corrupted, etc., and to be able to restore them if necessary. To demonstrate this: If you remove one or all files by accident, a RAID will mirror this change, but it will not provide the means to restore the file(s). So while there is clearly an overlap, they are not the same and should be used in conjunction with each other.
	RAID-4	RAID-4
	This RAID level, not widely used, uses N disks to store useful data, and an extra disk to store redundancy information. If that disk fails, the system can reconstruct its contents from the other N. If one of the N data disks fails, the remaining N-1 combined with the “parity” disk contain enough information to reconstruct the required data.	此 RAID 级别未广泛使用，使用 N 个磁盘来存储有用的数据，以及额外的磁盘来存储冗余信息。如果磁盘发生故障，系统可以从其他 N 个磁盘重构数据。如果其中一个 N 数据磁盘发生故障，则剩余的 N-1 与"奇偶校验"磁盘相结合，包含足够的信息来重建所需的数据。
	<primary>RAID</primary><secondary>4</secondary>	<primary>安装</primary><secondary>自动安装</secondary>
	<primary>RAID</primary><secondary>parity</secondary>	<primary>安装</primary><secondary>自动安装</secondary>

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PRIMARY	主键	Debian Handbook
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zh-CN/12_advanced-administration.po, string 65