DATOptic RM12-S6.TB - Rackmount - Manual (Page 25)

WEB BROWSER-BASED CONFIGURATION
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Note:
1. If the volume is RAID level 30, 50, or 60, you can not
change the volume to another RAID level. If the volume
is RAID level 0, 1, 10(1E), 3, 5, or 6, you can not change
the volume to RAID level 30, 50, or 60.
2.Power failure may damage the migration data. Please
backup the RAID data before you start the migration
function.
6.6.5 Check Volume Set
To check a volume set from a RAID set:
(1). Click on the “Check Volume Set” link.
(2). Click on the volume set from the list that you wish to check.
Click on “Confirm The Operation” and click on the “Submit” but-
ton. Use this option to verify the correctness of the redundant
data in a volume set. For example, in a system with dedicated
parity, volume set check means computing the parity of the data
disk drives and comparing the results to the contents of the
dedicated parity disk drive. The checking percentage can also be
viewed by clicking on “RAID Set Hierarchy” in the main menu.
6.6.6 Schedule Volume Check
A volume check is a process that verifies the integrity of redun-
dant data. To verify RAID 3, 5, 6, 30, 50 or 60 redundancy, a
volume check reads all associated data blocks, computes parity,
reads parity, and verifies that the computed parity matches the
read parity.
Volume checks are very important because they detect and cor-
rect parity errors or bad disk blocks in the drive. A consistency
check forces every block on a volume to be read, and any bad
blocks are marked; those blocks are not used again. This is criti-
cal and important because a bad disk block can prevent a disk
rebuild from completing. We strongly recommend that you run
consistency checks on a regular basis—at least once per week (
set on ‘Scheduler). Volume checks degrade performance, so you
can also run them when the system is idle (set by “Checking After
System Idle”).