If your answer was RAID-1, you are correct!

RAID-1: Mirroring. All of the data on one disk is copied exactly onto a second disk. Neither disk is the master or primary -- the disks are peers. For writes to be deemed complete, they must make it to both disks. If one disk fails, its partner keeps right on running, without interruption. The good news with this level is that it's very easy to manage and it does not require significant levels of CPU for normal operations or for recovery. The downside to this level is the expense -- for every gigabyte of disk you wish to protect, you need a second, matching gigabyte. In other words, this requires twice as much disk space as unprotected disks.

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This was first published in April 2005

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