Tag Archives: mdadm

mdadm: RAID-5

RAID 5 (block-level striping with distributed parity) distributes parity along
with the data and requires all drives but one to be present to operate; drive
failure requires replacement, but the array is not destroyed by a single drive
failure. Upon drive failure, any subsequent reads can be calculated from the
distributed parity such that the drive failure is masked from the end user. The
array will have data loss in the event of a second drive failure and is
vulnerable until the data that was on the failed drive is rebuilt onto a
replacement drive. A single drive failure in the set will result in reduced
performance of the entire set until the failed drive has been replaced and
rebuilt.

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