Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 165)

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WEB BROWSER-BASED CONFIGURATION
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.
Tick on “Confirm The Operation” and click on the “Submit” button.
Use this option to verify the correctness of the redundant data in
a volume set. For example, in a system with dedicated parity, vol -
ume 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 click-
ing 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).