User's Manual

Virtual Disks 225
The following table describes some of the possible scenarios that may/may
not result in virtual disk bad blocks:
Table 12-2. Sample Scenarios For Virtual Disk Bad Blocks
RAID Level
Virtual Disk
State Scenario Result
RAID 0 Degraded One bad block on a
physical disk.
The controller cannot regenerate
data from peer disks as there is no
redundancy. This results in a
virtual disk bad block.
RAID 5 Ready One bad block on a
physical disk.
The controller regenerates data
from peer disks and sends a Write
to the bad block. The disk then
re-maps the Logical Block
Addressing (LBA) to another
physical location. The problem is
resolved.
RAID 5 Degraded One bad block on a
physical disk.
The controller cannot regenerate
data from peer disks because one
drive is missing. This results in a
virtual disk bad block.
RAID 5 Ready One bad block on
two physical disks at
the same location.
The controller cannot regenerate
data from peer disks. This results
in a virtual disk bad block.
RAID 6 Partially
degraded (one
failed/missing
physical disk)
One bad block on a
physical disk.
The controller regenerates data
from peer disks and sends a Write
to the bad block. The disk then
re-maps the LBA to another
physical location. The problem is
resolved.
RAID 6 Degraded (two
failed/missing
physical disk)
One bad block on a
physical disk.
The controller cannot regenerate
data from peer disks. This results
in a virtual disk bad block