User's Manual

224 Virtual Disks
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. The following sections
provide additional information on rebuilding disks.
• Replacing a Failed Disk describes how to replace a failed physical disk and
initiate a rebuild.
• Set Rebuild Rate describes how to set the rebuild rate on selected
controllers.
• A Rebuild Does Not Work describes situations in which a rebuild does not
work.
Virtual Disk Bad Block Management
What is a Virtual Disk Bad Block?
Virtual disk bad blocks are due to bad blocks on one or more member physical
disks. 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.