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RAID6工作原理图解及特点分析

RAID6RAID 5相比,增加了第二个独立的奇偶校验信息块。 两个独立的奇偶系统使用不同的算法, 数据的可靠性非常高. 即使两块磁盘同时失效,也不会影响数据的使用。 但需要分配给奇偶校验信息更大的磁盘空间,相对于RAID 5有更大的“写损失”。RAID6 的写性能非常差, 较差的性能和复杂的实施使得RAID6很少使用。

RAID6: Independent Data disks with two independent distributed parity schemes

Characteristics/Advantages

1. RAID 6 is essentially an extension of RAID level 5 which allows for additional fault tolerance by using a second independent distributed parity scheme (two-dimensional parity)

2. Data is striped on a block level across a set of drives, just like in RAID 5, and a second set of parity is calculated and written across all the drives; RAID 6 provides for an extremely high data fault tolerance and can sustain multiple simultaneous drive failures

3. Perfect solution for mission critical applications

Disadvantages

1. Very complex controller design

2. Controller overhead to compute parity addresses is extremely high

3. Very poor write performance

4. Requires N+2 drives to implement because of two-dimensional parity scheme

raid6

作者: 分类:服务器管理 标签: 时间:2008年1月2日

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