User's Manual

Choosing RAID Levels And Concatenation
Maintaining The Integrity Of Redundant Virtual Disks
Does my controller support this feature? See Supported Features.
The virtual disk Check Consistency task verifies the accuracy of the redundant (parity) information. This
task only applies to redundant virtual disks. When necessary, the Check Consistency task rebuilds the
redundant data.
To verify redundant information of a virtual disk:
1. Locate the controller on which the virtual disk resides in the tree view. Expand the controller object
until the Virtual Disks object is displayed.
2. Select the Check Consistency task from the virtual disk’s Tasks drop-down list box and click
Execute.
Rebuilding Redundant Information
Does my controller support this feature? See Supported Features.
If you have a redundant virtual disk, you can reconstruct the contents of a failed physical disk onto a new
disk or a hot spare. A rebuild can take place during normal operation, but it degrades performance.
Related Links
Replacing A Failed Disk
Setting The Rebuild Rate
A Rebuild Does Not Work
Managing Virtual Disk Bad Block Management
Virtual disk bad blocks are bad blocks on one or more member physical disks. The read operation on the
virtual disks having bad blocks may fail.
Storage Management generates a critical alert (2387) to notify you of the bad blocks on the virtual disk.
Virtual disk bad blocks are discovered when the controller performs any operation that requires scanning
the disk. Examples of operations that may result in this alert are:
• Consistency check
• Rebuild
• Virtual disk format
• I/O
• Patrol Read
Recovering a physical disk bad block depends on the RAID level and state of the virtual disk. If a virtual
disk is redundant, the controller can recover a bad block on a physical disk. If a virtual disk is not
redundant, then the physical disk bad block results in a virtual disk bad block.
The following table describes some of the possible scenarios that may/may not result in virtual disk bad
blocks:
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