Dell PowerVault MD3000 - Manual (Page 63)

Disk Groups and Virtual Disks
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If you receive a warning that the snapshot repository virtual disk is becoming
full, you may expand the snapshot repository virtual disk from MD Storage
Manager. See "Snapshot Repository Capacity" on page 79 for step-by-step
instructions.
Storage Array Media Scan
The media scan is a long-running 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.
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 0 virtual disks and degraded RAID 1 and RAID 5 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.
Changing Media Scan Settings
1 Click the Tools tab, then click Change Media Scan Settings.
2 Select the number of days allowed for the media scan to complete in the
Scan duration (days) box.
NOTE:
Performing the media scan frequently may negatively impact the
performance of other operations. Adjust scan duration based on the
performance needs of your storage array.