Glossary
RAID Level Virtual Disk State Scenario Result
RAID 5 Ready One bad block on two
physical disks at the
same location.
The controller cannot
regenerate data from
the 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
the peer disks and sends
a Write to the bad block.
The disk then remaps
the LBA to another
physical location. The
problem is resolved.
RAID 6 Degraded (two failed/
missing physical disks)
One bad block on a
physical disk.
The controller cannot
regenerate data from
the peer disks. This
results in a virtual disk
bad block.
RAID 6 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 remaps
the Logical Block
Addressing (LBA) to
another physical
location. The problem is
resolved.
Recommendations For Clearing Bad Blocks
Storage Management allows you to clear the bad block warnings. To clear bad blocks, the following
procedure is recommended:
1. Perform a backup of the virtual disk with the Verify option selected.
One of the following scenarios may occur:
• Backup operation fails on one or more files. In this case, restore the file from a previous backup.
After restoring the file, proceed to step 2.
• Backup operation completes without error. This indicates that there are no bad blocks on the
written portion of your virtual disk.
If you still receive bad block warnings, the bad blocks are in a non-data area. Proceed to step 2.
2. Run Patrol Read and check the system event log to ensure that no new bad blocks are found.
If bad blocks still exist, proceed to step 3. If not, the condition is cleared without the need for step 3.
3. To clear these bad blocks, execute the Clear Virtual Disk Bad Blocks task.
This Clear Virtual Disk Bad Block feature is applicable to PERC H310 Adapter, PERC H310 Mini
Monolithic, PERC H310 Mini Blades, PERC H700, PERC H710 Adapter, PERC H710 Mini Blades, PERC
H710 Mini Monolithic, PERC H710P Adapter, PERC H710P Mini Blades, PERC H710P Mini Monolithic,
153