Netgear EDA 500 User Manual
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JBOD. This most basic RAID level does not protect your data from loss if one of your drives fails.
JBOD is available only on volumes consisting of a single hard disk.
JBOD is available only on volumes consisting of a single hard disk.
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RAID 0. RAID 0 distributes data across multiple disks, resulting in improved disk performance compared
to systems that do not use RAID formatting. The total capacity of your storage system equals the
capacity of the smallest of your disk drives times the number of disks. RAID 0 is available on volumes
consisting of two or more hard disks.
to systems that do not use RAID formatting. The total capacity of your storage system equals the
capacity of the smallest of your disk drives times the number of disks. RAID 0 is available on volumes
consisting of two or more hard disks.
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RAID 1. This RAID level provides full redundancy of your data, because it duplicates data across
multiple disks. Exactly the same data is stored on two or more disks at all times. RAID 1 protects your
data from loss if one disk fails. The total capacity of your storage system equals the capacity of your
smallest disk.
multiple disks. Exactly the same data is stored on two or more disks at all times. RAID 1 protects your
data from loss if one disk fails. The total capacity of your storage system equals the capacity of your
smallest disk.
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RAID 5. This RAID level also provides data redundancy, but it requires at least three disks. RAID 5
uses the capacity of one disk to protect you from data loss if one disk fails. Your data is distributed
across multiple disks to improve disk performance. The total capacity of your storage system equals
the capacity of all your disks minus the capacity of one disk. It is supported on systems with at least
four drive bays.
uses the capacity of one disk to protect you from data loss if one disk fails. Your data is distributed
across multiple disks to improve disk performance. The total capacity of your storage system equals
the capacity of all your disks minus the capacity of one disk. It is supported on systems with at least
four drive bays.
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RAID 6. This RAID level can recover from the loss of two disks.Your data is distributed across multiple
disks to improve disk performance. The total capacity of your storage system equals the capacity of
all your disks minus the capacity of two disks. It is supported on systems with at least four drive bays.
disks to improve disk performance. The total capacity of your storage system equals the capacity of
all your disks minus the capacity of two disks. It is supported on systems with at least four drive bays.
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RAID 10 (or 1+0). This RAID level uses both RAID 1 and RAID 0 technology. First, your data is
duplicated so that exactly the same data is stored on two or more disks. Then, the data is distributed
across additional disks to improve disk performance. It is supported on systems with at least four drive
bays.
duplicated so that exactly the same data is stored on two or more disks. Then, the data is distributed
across additional disks to improve disk performance. It is supported on systems with at least four drive
bays.
The Flex-RAID levels that you can select depend on the number of disks included in the volume. The
following table describes the Flex-RAID levels that are available for a given number of disks. It also
indicates whether adding a disk for data protection is possible for each configuration.
following table describes the Flex-RAID levels that are available for a given number of disks. It also
indicates whether adding a disk for data protection is possible for each configuration.
Table 2. Flex-RAID levels and data protection
Can I add a disk for data protection?
RAID Level
Number of Disks per Vol-
ume
ume
No. (JBOD is available only for volumes consisting of one
disk)
disk)
JBOD
1
No. (Volume protection is already redundant.)
RAID 1
2
No. (RAID 0 does not offer protection.)
RAID 0
2 or more
Yes. (Additional disk provides dual redundancy and converts
the volume to RAID 6.)
the volume to RAID 6.)
RAID 5
3 or more
No. (Volume protection is already redundant.)
RAID 10
4 or more(even number)
No. (Volume is already protected with dual redundancy.)
RAID 6
4 or more
Manage Volumes
This section discusses volume management on your ReadyNAS system. You can add or delete volumes
from the system. Additionally, you can change the volume’s RAID mode and level. This section also covers
from the system. Additionally, you can change the volume’s RAID mode and level. This section also covers
Volume Configuration
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ReadyNAS OS 6.2