Netgear RN528X Software Manual - Page 24
Flex-RAID
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ReadyNAS OS 6.7 Figure 4. X-RAID disk usage 1. The first disk that you install is used for initial (unprotected) storage space. 2. The second disk that you install is reserved for data protection (parity information). 3. Installing additional disks increases your storage space. Note For systems with at least two disks and up to five disks, X-RAID reserves the capacity of one disk for data protection. (If there are six or more disks, the default format is RAID 6, which reserves two disks.) The actual space reserved for data protection is distributed across all disks. Flex-RAID NETGEAR's Flex-RAID technology allows you to choose from among several industry-standard RAID levels: • 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. • 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. • 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. • 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 Volume Configuration 24