A media scan is a process that runs on the storage array. The media scan provides error detection on the physical disk media. The media scan process finds media errors before they disrupt normal physical disk reads and writes. The media scan process scans the virtual disk data to verify that it can be accessed. You have the option to select virtual disks on which to scan the consistency data. The media scan reports any errors that are found to the Event Log.
You can make changes to the media scan settings from the Change Media Scan Settings dialog.
| Error | Description and Result |
|---|---|
| Unrecovered media error |
The data could not be read on the first attempt or on any subsequent attempts. For virtual disks with redundancy protection, the data is reconstructed, the data is rewritten to the physical disk, and the data is verified. The error is reported to the Event Log. For virtual disks without redundancy protection, the error is not corrected, but the error is reported to the Event Log. Virtual disks without redundancy protection include RAID 0 virtual disks or degraded RAID 1, RAID 5, and RAID 6 virtual disks. |
| Recovered media error |
The physical disk could not read the requested data on the first attempt but successfully read the data on the subsequent attempt. The data is rewritten to the physical disk and verified. The error is reported to the Event Log. |
| Consistency mismatches (consistency check must be turned on) |
Consistency errors are found. The first 10 consistency mismatches that are found on the virtual disk are reported to the Event Log. |
| Unfixable error |
The data could not be read, and parity information or consistency information could not be used to regenerate the data. For example, the consistency information cannot be used to reconstruct the data on a degraded virtual disk. The error is reported to the Event Log. |