Dell MD3200, MD3220 owner manual Storage Array Media Scan, Changing Media Scan Settings, 136

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 level 1, RAID level 5, and RAID level 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.

•Redundancy mismatches error—The first 10 redundancy mismatches that are found on the virtual disk are reported to the event log.

•Unfixable error—Data could not be read and parity or redundancy information could not be used to regenerate the data. For example, redundancy information cannot be used to reconstruct the data on a degraded virtual disk. The error is reported to the event log.

For more information, see the PowerVault Modular Disk Storage Manager online help topics.

Changing Media Scan Settings

To change the media scan settings:

1In the AMW, select the Logical tab and select any virtual disk.

2Select Virtual Disk→ Change→ Media Scan Settings. The Change Media Scan Settings window is displayed.

3Deselect Suspend media scan if selected.

4In Scan duration, enter or select the duration (in days) for the media scan.

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Configuration: Disk Groups and Virtual Disks