Dell PowerVault MD3660f Administrator's Guide - Page 85

Storage Array Media Scan, Changing Media Scan Settings

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• Mirror repositories On the target storage array: 1. Insert the exported physical disks into the available physical disk slots. 2. Review the Import Report for an overview of the disk group that you are importing. 3. Check for non-importable components. 4. Confirm that you want to proceed with the import procedure. NOTE: Some settings cannot be imported during the import disk group procedure. 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. • 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 online help topics. Changing Media Scan Settings To change the media scan settings: 1. In the AMW, select the Storage & Copy Services tab and select any virtual disk. 2. From the menu bar, select Storage → Virtual Disk → Change → Media Scan Settings. The Change Media Scan Settings window is displayed. 3. Deselect Suspend media scan, if selected. 4. In Scan duration (in days), enter or select the duration (in days) for the media scan. 85

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•
Mirror repositories
On the target storage array:
1.
Insert the exported physical disks into the available physical disk slots.
2.
Review the Import Report for an overview of the disk group that you are importing.
3.
Check for non-importable components.
4.
Confirm that you want to proceed with the import procedure.
NOTE:
Some settings cannot be imported during the import disk group procedure.
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.
•
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 online help topics.
Changing Media Scan Settings
To change the media scan settings:
1.
In the AMW, select the
Storage & Copy Services
tab and select any virtual disk.
2.
From the menu bar, select
Storage
→
Virtual Disk
→
Change
→
Media Scan Settings.
The
Change Media Scan Settings
window is displayed.
3.
Deselect
Suspend media scan
, if selected.
4.
In
Scan duration (in days)
, enter or select the duration (in days) for the media scan.
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