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ManualsBrandsNetgear ManualsComputers & Laptops"NetGear RN21400-100NES Netgear ReadyNAS RN214 NAS Server - ARM Cortex A15 Quad-core (4 Core) 1.40 GHz - 4 x Total Bays - 2 GB R
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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.
• RAID 6. This RAID level provides recovery 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.
• 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.
• RAID 50 (or 5+0). This RAID level uses both RAID 5 and RAID 0 technology. First, a disk is used to
provide redundancy. Then your data is distributed across multiple disks to improve disk performance.
A minimum of six disks are required. The total capacity of your storage system equals the capacity of
all your disks minus the capacity of two disks.
• RAID 60 (or 6+0). This RAID level uses both RAID 6 and RAID 0 technology. First, two disks are used
to provide redundancy. Then your data is distributed across multiple disks to improve disk performance.
A minimum of eight disks are required. The total capacity of your storage system equals the capacity
of all of your disks minus the capacity of four disks.
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.
Table 1. Flex-RAID levels and data protection
Can I add a disk for data protection?RAID LevelMinimum Number of Disks
per Volume
No. (JBOD is available only for volumes consisting of one disk)JBOD1
No. (Volume protection is already redundant.)RAID 12
Yes. (Additional disk provides single redundancy and converts the
volume to RAID 5.)
RAID 02 or more
Yes. (Additional disk provides dual redundancy and converts the volume
to RAID 6.)
RAID 53 or more
No. (Volume protection is already redundant.)RAID 104 or more(even number)
No. (Volume is already protected with dual redundancy.)RAID 64 or more
No, but you can add two disks. (The additional disks provide dual
redundancy and converts the volume to RAID 60.)
RAID 506 or more
No. (Volume is already protected with dual redundancy.)RAID 608 or more
ReadyTIER,Tiers, and Metadata
Using ReadyTIER, you can define tiers within a volume. For example, when using a mix of hard disk drives
and SSDs in a volume, you can organize the SSDs as a tier within the volume. If a volume contains tiers,
ReadyNAS OS automatically writes volume metadata (Btrfs metadata) to higher-performing tiers. Volume
metadata includes such things as directory information, file names, file permissions, and checksums. Because
volume metadata is read and written more frequently than specific blocks of data, under some circumstances
performance is improved.
Volume Configuration
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ReadyNAS OS 6.9.3