RAID1和RAID5的真正含义是什么? [英] What do RAID1 and RAID5 really mean?

问题描述

我对RAID1和RAID5硬件解决方案有一些疑问.例如，我在Windows Server 2003中将RAID1实施为磁盘镜像.如何在实际环境中测试该磁盘镜像的作用?这是否意味着如果一个硬盘驱动器发生故障，系统将继续在镜像驱动器上运行?或者，当一个硬盘驱动器发生故障时，系统将发生故障，但是一个硬盘驱动器可以将系统重新引导至镜像驱动器吗?

同样，如果我使用3个磁盘实现RAID5，它的实际作用是什么?它是否支持故障转移，数据冗余或两者兼而有之? RAID5如何实现它?

Hi,

I have got some questions about RAID1 and RAID5 hardware solutions. For example, I implemented RAID1 as disk mirroring in Windows Server 2003. How do I test this disk mirroring in action in the real world? Does it mean if one hard drive has failed, the system will continue to operate on the mirrored drive? Or when one hard drive has failed, the system will fail but one can reboot the system to the mirrored drive?

Similarly, if I implement a RAID5 using 3 disks, what does it really do? Does it support failover, data redundancy or both? How does RAID5 achieve it?

推荐答案

您可以通过丢弃其中一个驱动器来测试磁盘镜像.如果它们是可热插拔的，则只需拉出其中一个，然后放入新的空磁盘即可.在这所有过程中，系统将继续运行，尽管可能比重建过程中的速度慢.

RAID-5具有三个磁盘:
基本上，它将1个扇区写入磁盘1，将1个扇区写入磁盘2. ，然后将两个扇区的校验和写入磁盘3.重复上述步骤，但总是将校验和写入不同的磁盘.这样，两个磁盘就足以重建阵列，哪个磁盘发生故障都没有关系，并且与RAID-1相比，它具有更快的优势.

RAID不能提供故障转移.所有磁盘一直在使用.但是，某些RAID案例具有热备份磁盘，该磁盘会自动替换发生故障的磁盘，以使漏洞窗口尽可能短.
也没有真正的数据冗余:如果您不小心删除了某些内容，它会自动删除磁盘.丢失.

RAID仅增加正常运行时间，并在一定程度上增加吞吐量.

现在我的另一半进入房间并命令我停止键入.

这么长时间.

You can test disk mirroring by trashing one of the drives. If they are hot-swapable, just yank one out and put in a new, empty disk. The system will continue to operate during all this, though possibly slower than usual during the rebuild.

RAID-5 with three disks:
Basically, it writes 1 sector to disk 1, 1 sector to disk 2, then checksum of the two sectors to disc 3. The steps are repeated, but the checksum is always written to a different disk. That way, two disks are enough to rebuild the array, it does not matter which disk failed, AND it ofers speed advantages compared to RAID-1.

RAID as such does not offer failover. All disks are in use all the time. However, some RAID-cases have hot-standby-disks, which automatically replace failed ones, in order to keep the window of vulnerability as short as possible.
There also is no real data redundancy: If you accidentally delete something, its lost.

RAIDs only increase uptime and, to a certain amount, throughput.

And now my significant other has entered the room and ordered me to stop typing.

So long.

这篇关于RAID1和RAID5的真正含义是什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！