
Advanced Technology and Systems Co., Ltd.
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4.2.12
Surface Check
The Surface Check function prevents a double fault from occurring when an error correcting code
(ECC) fault is encountered while the ArrayMasStor is operating in degraded mode. This function is
not available in RAID Level 0, because the data are not redundant. In RAID Levels 1 and 5, the
surface check scans the drives for ECC faults and fixes these errors by overwriting them with correct
data generated from the mirror or parity data. The ArrayMasStor uses three selectable methods to
check data:
Surface check: This scans the entire data area for ECC faults and reconstructs and overwrites errors.
Parity regeneration: In RAID Level 5, this regenerates each parity block and rewrites it to the drives.
Random Check: This scans random storage areas for ECC faults and fixes the errors.
All of these tests should be performed periodically to ensure data and parity consistency.
From the Change Configuration menu, use the up or down button to
choose the SURFACE CHECK option.
After selecting the SURFACE CHECK option, the ArrayMasStor
immediately checks the entire data storage area.
During the procedure, the progress of the scan is displayed in percent.
When the scan is complete, the display returns to the main menu.
Choose the PARITY CHECK option from the CHECK MODE menu to start
the parity regeneration process. This process begins with the surface check
procedure and is followed by the parity regeneration procedure. This option
is only available if one of the LUNs is set to RAID Level 5.
During the procedure, the progress of the scan is displayed in percent.
When the scan is complete, the display returns to the main menu.
Choosing RANDOM CHECK from the SURFACE CHECK menu
starts the random check procedure.
When random check option is selected, the start time for the check
appears on the display.
SURFACE CHECK
PROGRESS 80%
CHECK MODE
SURFACE CHECK
RAID SUBSYSTEM
SURFACE CHECK
RAID SUBSYSTEM
PARITY CHECK
RAID SUBSYSTEM
PROGRESS 80%
RAID SUBSYSTEM
RANDOM CHECK
RAID SUBSYSTEM
TIME: 2300