Biostar M6TSU M6TSU user's manual - Page 95

Device Status

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Chapter 3 Trouble Shooting 3.3.11 Device Status Raid Administrator detects the status of each device and shows their status information with different icons to prompt users (see below). Note: When reading data from the mirror array, the source disk is always to be read first, and the mirror disk will not be accessed if the data is read out from the source disk and so the mirror disk's failure can not be detected. But when writing data to the mirror array, both of the member disks will be accessed, so failure on either of them can be detected. Suggestion: When a failure occurs on a member disk of the mirror array, this array will be labeled in error status. At this time, the mirror array can continue work normally with the other normal disk. In order to avoid data loss due to the failure of the left disk, the user shall settle the fault first and rebuild mirror with this left normal disk. Warning: 1. When the member disk of either the stripe array or the span array failed ,the corresponding disk array will be labeled in error status, and it will not be able to work. 2. If both the source disk and the mirror disk failed, the mirror array will not be able to work. The user shall settle the fault quickly. 3-30

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Chapter 3
Trouble Shooting
3-30
3.3.11 Device Status
Raid Administrator detects the status of each device and shows their status
information with different icons to prompt users (see below).
Note:
When reading data from the mirror array, the source disk is always to
be read first, and the mirror disk will not be accessed if the data is
read out from the source disk and so the mirror disk's
failure can not be detected. But when writing data to the mirror array,
both of the member disks will be accessed, so failure on either of
them can be detected.
Suggestion:
When a failure occurs on a member disk of the mirror array, this array
will be labeled in error status. At this time, the mirror array can continue
work normally with the other normal disk. In order to avoid data
loss due to the failure of the left disk, the user shall settle the fault first
and rebuild mirror with this left normal disk.
Warning:
1. When the member disk of either the stripe array or the span array
failed ,the corresponding disk array will be labeled in error status, and
it will not be able to work.
2. If both the source disk and the mirror disk failed, the mirror array will
not be able to work. The user shall settle the fault quickly.