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Maintenance
Bad Block Table
This function reads the Bad Block Table from the controller and displays it on the
screen. A bad block is a section on a disk that cannot reliably store information.
Identifying the number and location of bad blocks can help troubleshoot a failed
rebuild operation or help predict a physical drive failure. The controller saves two
tables: a Rebuild BBT and a Write Back BBT.
Rebuild BBT
During a rebuild operation, data is read from existing redundant drives in the
drive group, reconstructed by the controller, and then written to the replacement
drive. If a read error (on an existing drive) occurs during a rebuild, the process
will fail. In that case, one of the existing drives (not the replacement drive) has
errors.
Select the View Rebuild BBT option to determine which drive has errors.
Write Back BBT
During normal operation if you have a system drive's write policy set to write
back, a second bad block table is maintained in the controller's memory. This
table is updated whenever an error occurs during a read or write operation.
View BBTs
To view the bad block tables:
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Bad Block Table
Select Bad Block Table from the Tools menu. The software displays a window
showing the two table options.
Select the table you want to view.
Press any key to scroll down through the blocks. When you exit the display, a
prompt appears to save the BBT to disk.
A bad block table is cleared after viewing. If you want to save the
information, select YES.
The software prompts you for a path and filename for the data. If you don't
want to save the data, select NO.
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