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The Linux kernel configuration item CONFIG_MD_RAID5:

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A RAID-5 set of N drives with a capacity of C MB per drive provides the capacity of C * (N - 1) MB, and protects against a failure of a single drive. For a given sector (row) number, (N - 1) drives contain data sectors, and one drive contains the parity protection. For a RAID-4 set, the parity blocks are present on a single drive, while a RAID-5 set distributes the parity across the drives in one of the available parity distribution methods.

Information about Software RAID on Linux is contained in the Software-RAID mini-HOWTO, available from There you will also learn where to get the supporting user space utilities raidtools.

If you want to use such a RAID-4/RAID-5 set, say Y. To compile this code as a module, choose M here: the module will be called raid5.

If unsure, say Y.



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