User guide

1
3
RAID
0
: RAID 0 (a
l
so ca
ll
e
d
Striping)
d
istri
b
utes
d
ata across a
ll
d
is
k
s
in a wa
y
which can im
p
rove throu
g
h
p
ut, while retainin
g
f
ull ca
p
acit
y
.
However, RAID 0
p
rovides no fault tolerance so in case of
p
ossible
failure of an
y
disk, all data will be lost. Available ca
p
acit
y
is the
combined ca
p
acit
y
o
f
all
f
our disk cartrid
g
es.
RAID 1 with S
p
are: RAID 1 (also called Mirrorin
g
) stores a du
p
licate set
of data onto at least one other disk so that if one disk fails
,
all data can
be recovered
f
rom the other disk. The PowerBay NAS array implements
RAID 1 in a wa
y
that
p
rovides for even more redundanc
y
, resultin
g
in
maximum fault tolerance. It does this b
y
(a) usin
g
two drives as mirrors
instead o
f
just one, and (b) using the
f
ourth drive as a spare. The spare
drive will automaticall
y
rebuild as a fresh mirror whenever a failure of
one of the other three drives is detected. Available ca
p
acit
y
is e
q
ual to
that o
f
only one disk cartridge.
RAID
5
: RAID 5 (Striping with distributed parity) combines three or
more disks in a way that protects data against loss of any one disk. The
stora
g
e ca
p
acit
y
of the arra
y
is reduced b
y
one disk. The PowerBa
y
NAS array implements RAID 5 in one of two ways
:
1. Select “RAID 5” to build a 4-disk array. Available capacity will be
equal to that of three disk cartridges
.
2. Select “RAID 5 with Spare” to build a 3-disk array. The fourth disk
is use
d
as a s
p
are. T
h
e s
p
are
d
rive wi
ll
automatica
lly
re
b
ui
ld
to
complete a healthy 3-disk array whenever a failure of one of the
other three drives is detected. Available capacity is equal to that
of two disk cartridges.
RAID
6
: RAID 6 (Striping with distributed dual parity) combines all
f
our
disks in a way that protects data against loss of any two disks. In the
event of a single disk failure, the use of dual parity allows for time to
rebuild the array sa
f
ely without the data being at risk i
f
an additional
drive fails before the rebuild is complete. Available capacity is equal to
that of two disk cartrid
g
es
.
Array Mirroring to eSATA Driv
e
T
he full data of the PowerBay NAS array can be continuously copied
to an attached eSATA drive. If a catastrophic failure of the NAS array
occurs
,
the full data can be restored from the eSATA drive once the
NAS array
h
as
b
een repaire
d
or rep
l
ace
d
. Array mirroring to eSATA
is su
pp
orted onl
y
in RAID modes 0, 5, and 6 and is NOT su
pp
orted in
RAID 1 with S
p
are or in RAID 5 with S
p
are. The ca
p
acit
y
of the eSATA
drive must be at least as large as the capacity of the NAS array.
I
f
you want to use this
f
unction, please enable it during the
fi
rst time
you con
fi
gure the array.
W
hen the mirror function is in use, the Disk Confi guration page will
show the status of the mirror system, and will present action buttons
to temporarily disable the mirror
f
unction (“Unmirror” Button) and to
restore data from the eSATA drive to the NAS
(
“Restore” Button
).
WARNING: When using the eSATA mirroring
f
unction, you MUST attach and power
up the eSATA drive BEFORE you power up the PowerBay NAS array. This power-up
sequence must be
f
ollowed EACH TIME you power cycle the PowerBay NAS array. I
f
you
power up the PowerBay NAS array
fi
rst, and later attach and power up the eSATA drive,
the eSATA drive will not be recognized as a mirror device, so the eSATA drive will no
l
onger
b
e sync
h
ronize
d
to t
h
e NAS
d
ata
.
Array Encryptio
n
T
he PowerBa
y
NAS arra
y
su
pp
orts 256-bit Advanced Encr
yp
tion
Standard (AES) full disk encr
yp
tion. Encr
yp
tion ma
y
be enabled for
any RAID mode. I
f
eSATA mirroring is enabled, then data copied to the
eSATA drive will also be encr
yp
ted
.
If you want to use this function, please enable it during the fi rst time
you con
fi
gure the array.
Once the drive has been confi
g
ured usin
g
encr
yp
tion, the full arra
y
can
thereafter be LOCKED or UNLOCKED using a password key. When the
array is LOCKED it will not show up on the LAN as a shared volume and
users cannot access it for stora
g
e. All four cartrid
g
e LED’s will remain
red while the array is LOCKED. For convenience, several methods are
provided to UNLOCK a LOCKED array
:
1. Enter the NAS user inter
f
ace and press UNLOCK on the Disk
Confi guration page. You will be prompted to enter the password
k
ey string
.
2. Insert a USB Ke
y
device into the front USB
p
ort of the PowerBa
y
NAS array. This Key device may be either a
fl
ash drive or a hard
drive, and must have been previously con
fi
gured with the key
fi
le usin
g
the ‘Store Ke
y
in USB Drive’
p
rocedure. Once the arra
y
is unlocked, the USB Key device may be removed.
3. Enter the NAS user inter
f
ace and load the key
fi
le
f
rom a
computer on the LAN using the ‘Load”
f
unction on the Key
Management page. This key
fi
le must have been previously
stored onto the computer using the ‘Save’
f
unction on the Key
Management page. Alternatively, the key
fi
le might have been
previously e-mailed to a user using the ‘Mail’
f
unction on the Key
Management page.
NOTICE: When encryption is enabled, data transfer rates may be reduced
.