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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Consistency check

A consistency check verifies the correctness of data in a redundant array—RAID levels 1, 5, 6, and 10. For example, in a system with parity, checking consistency involves computing the data on one physical disk and comparing the results to the contents of the parity physical disk.

A consistency check is similar to a background initialization. The difference is that background initialization cannot be started or stopped manually, while consistency check can.

NOTE: It is recommended that you run data consistency checks on a redundant array at least once a month. This data consistency check allows detection and automatic replacement of unreadable sectors. Finding an unreadable sector during a rebuild of a failed physical disk is a serious problem because the system does not have the consistency to recover the data.
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