QNAP TS-859 Pro+, User Manual, Page: 54 / 242

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RAID Level
RAID Status Traditional
RAID 5 QNAP RAID 5 Traditional
RAID 6 QNAP RAID 6
Degraded mode N-1 N-1 N-1 & N-2 N-1 & N-2
Read Only
Protection (for
immediate data
backup & HDD
replacement) N/A N-1, bad blocks
found in the
surviving drives
of the array.
N/A N-2, bad blocks
found in the
surviving drives of
the array.
RAID Recovery
(RAID Status:
Not Active) N/A If re-inserting
all the original
hard disk drives
to the NAS and
they can be
spun up,
identified,
accessed, and
the HDD
superblock is
not damaged.
N/A If re-inserting all
the original hard
disk drives to the
NAS and they can
be spun up,
identified,
accessed, and the
HDD superblock is
not damaged).
RAID Crash N-2 N-2 failed HDD
and any of the
remaining HDD
cannot be spun
up/ identified/
accessed. N-3 N-3 and any of the
remaining HDD
cannot be spun up/
identified/
accessed.
N = Number of hard disk drives in the array