Installing the NAS
Con
fi
guration
Description
RAID 5 data carriers
The data is distributed to all hard disks in
the RAID 5 network. The parity information
is saved on each hard disk. If one hard
disk in the network fails, the network
transfers to degenerated mode. After the
failed hard disk has been replaced with
a new hard disk, the data from the other
disks in the network, which contain the
same parity information, can be restored.
To create a RAID 5 network, at least 3
hard disks are required. The storage
capacity of a RAID 5 network is equal to
(N - 1 (size of the smallest hard disk)). N
is the total number of hard disks in the
arrangement.
RAID 6 data carriers
The data is distributed to all hard disks
in the RAID 6 network. RAID 6 differs
from RAID 5 in that a second set of parity
information is distributed across all disks
in the network. The network can tolerate
the failure of two disks.
To create a RAID 6 network, at least 4
hard disks are required. The storage
capacity of a RAID 6 network is equal to
(N - 2 (size of the smallest hard disk)). N
is the total number of hard disks in the
arrangement.
RAID 10 data carriers
RAID 10 combines the advantages of
RAID 0 and RAID 1 in one system. It
offers security by mirroring all data to a
second set of hard disks and by applying
striping on all hard disk records in order to
speed up the data transfer.
RAID 10 requires an even number of hard
disks (at least 4 hard disks). The storage
capacity of the RAID 10 hard disk volume
is (size of hard disk with lowest capacity
in the array) N/2. N is the number of hard
disks in the volume.
With RAID 10, a maximum of 2 failed hard
disks out of 2 different pairs is permissible.
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Fujitsu
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