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The following figure illustrates how X-RAID2 uses new disks.
Figure 5. X-RAID2 disk usage
1. Initial storage space
2. Data protection
3. Additional storage space
Flex-RAID
Flex-RAID technology allows you to choose from among several industry-standard RAID
levels:
•
RAID 0. This RAID level is the simplest and is misnamed, because it does not offer
redundancy to protect your data from loss if one disk fails. RAID 0 distributes data across
multiple disks, which allows it to offer better performance than disks that do not use RAID
formatting. The total capacity of your storage system equals the capacity of all of your
disk drives.
•
RAID 1. This RAID level provides full redundancy of your data, because it duplicates data
across multiple disks. In RAID 1, 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. RAID 1 requires a minimum
of two disks and an even number of disks. In a two-disk system, the total capacity of your
storage system equals the capacity of your smallest disk.
•
RAID 5. Supported on ReadyNAS storage systems with at least four drive bays, RAID 5
uses one disk to protect you from data loss if one disk fails. The total capacity of your
storage system equals the capacity of all your disks minus the capacity of one disk.
Flex-RAID also lets you choose JBOD formatting for your disks. JBOD, which is short for just
a bunch of disks, refers to a set of hard disks that are not configured using RAID technology
and that the computer treats as individual disks. JBOD does not offer any data protection if a
disk fails. However, some people choose to use JBOD because it maximizes storage
capacity. It maximizes storage capacity because you do not use any storage space for data
protection when you configure your disks as JBOD.
ReadyNAS for Home RAIDiator 5.3
1
2
3
Disk Configuration
21
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