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

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Storage array media scan

The media scan is a background operation that examines virtual disks to verify that data is accessible. The process finds media errors before normal read and write activity is disrupted and reports errors to the event log.
NOTE: You cannot enable background media scans on a virtual disk comprised of Solid State Disks (SSDs).
Errors discovered by the media scan include:
  • Unrecovered media error — Data could not be read on the first attempt or on any subsequent attempts. For virtual disks with consistency protection, data is reconstructed, rewritten to the physical disk, and verified and the error is reported to the event log. For virtual disks without consistency protection (RAID 1, RAID 5, and RAID 6 virtual disks), the error is not corrected but is reported to the event log.
  • Recovered media error — Data could not be read by the physical disk on the first attempt but was successfully read on a subsequent attempt. Data is rewritten to the physical disk and verified and the error is reported to the event log.
  • Consistency mismatches error — The first 10 consistency mismatches that are found on the virtual disk are reported to the event log.
  • Unfixable error — Data could not be read and consistency or consistency information could not be used to regenerate the data. For example, consistency information cannot be used to reconstruct the data on a degraded virtual disk. The error is reported to the event log.
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