Storage Array Media Scan - Dell PowerVault MD3220 Owner's Manual

The following settings are removed/cleared during the procedure:
• Persistent reservations
• Host-to-virtual disk mappings
• Virtual disk copy pairs
• Snapshot virtual disks and snapshot repository virtual disks
• Remote mirror pairs
• Mirror repositories
Non-Importable Components
Some components cannot be imported during the import disk group
procedure. These components are removed during the procedure:
• Persistent reservations
• Mappings
• Virtual disk copy pairs
• Snapshot virtual disks and snapshot repository virtual disks

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 redundancy protection,
data is reconstructed, rewritten to the physical disk, and verified and the
error is reported to the event log. For virtual disks without redundancy
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.
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Configuration: Disk Groups and Virtual Disks