Panasonic WJ-HD716K ユーザーズマニュアル

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If a hard disk drive failure occurs in the RAID 5 or RAID 6 mode, the error display will appear as shown in the following table.
In the RAID 5 mode, it is possible to read data on the other hard disk drives and recover data even when a single hard disk drive 
becomes faulty (1 down).
In the RAID 6 mode, it is possible to read data on the other hard disk drives and recover data even when 2 hard disk drives 
become faulty (2 down).
When the hard disk drive becomes faulty (down), replace it immediately.
Refer to the operating instructions of the extension unit.
  *  Contact your dealer about replacement of HDD units.
Important:
 •  In the RAID 5 mode:
    If 2 or more hard disk drives become faulty (2 down) or when another hard disk drive becomes faulty during the data recov-
ery, it is impossible to recover data.
 •  In the RAID 6 mode:
    If 3 or more hard disk drives become faulty (3 down) or when another hard disk drive becomes faulty during the data recov-
ery, it is impossible to recover data.
 
Source
At a hard disk drive error (failure)
In the process of the recovery
Recorder/
Extension unit
Monitor 2  
(recorder) 
LCD (extension 
unit)
RAID 1 DOWN: [1down] 
RAID 2 DOWN: [2down] 
RAID 3 DOWN (only in the RAID 6 mode): [3down]
HDD access indi-
cators
Lights red: The respective hard disk drive is faulty 
(which can be recovered by replacing the hard 
disk drive)
 •  In the RAID 5 mode, it indicates that the
respective hard disk drive is the first faulty 
drive.
 •  In the RAID 6 mode, it indicates that the
respective hard disk drives are the first and 
second faulty drive.
Blinks red: The respective hard disk drive is faulty 
(which cannot be recovered even by replacing 
the hard disk drive).
 •  In the RAID 5 mode, it indicates that the
respective hard disk drive is the second faulty 
drive.
 •  In the RAID 6 mode, it indicates that the
respective hard disk drive is the third faulty 
drive.
Lights red and orange alternate-
ly: 
The respective hard disk drive in 
the RAID 5/RAID 6 mode is 
being recovered.
Recorder
[Error log] 
(Refer to Operating 
Instructions (PDF) 
for further informa-
tion.)
RAID 1 DOWN:
Recorder: MAIN RAIDm 1 DOWN
Extension unit: EXTu RAIDm 1 DOWN
RAID 2 DOWN:
Recorder: MAIN RAIDm 2 DOWN
Extension unit: EXTu RAIDm 2 DOWN
RAID 3 DOWN:
Recorder: MAIN RAID6 3DOWN
Extension unit: EXTu RAID6 3DOWN
m: Operational mode
u: Unit number
RAID recovery failure:
Recorder: MAIN RAIDm 
RECOVERY FAILURE
Extension unit: EXTu RAIDm 
RECOVERY FAILURE
m: Operational mode
u: Unit number
Error recovery of the hard disk drive (when operating in the RAID 
mode)