RAID
RAID stands for Redundant Array of Inexpensive (Independent) DisksIn most situations you will be using one of the following four levels of RAIDs.
- RAID 0
- RAID 1
- RAID 5
- RAID 10 (also known as RAID 1+0)
This article explains the main difference between these raid levels along with an easy to understand diagram.
In all the diagrams mentioned below:
- A, B, C, D, E and F – represents blocks
- p1, p2, and p3 – represents parity.
RAID LEVEL 0
Following are the key points to remember for RAID level 0.
- Minimum 2 disks.
- Excellent performance ( as blocks are striped ).
- No redundancy ( no mirror, no parity ).
- Don’t use this for any critical system.
RAID LEVEL 1
Following are the key points to remember for RAID level 1.
- Minimum 2 disks.
- Good performance ( no striping. no parity ).
- Excellent redundancy ( as blocks are mirrored ).
RAID LEVEL 5
Following are the key points to remember for RAID level 5.
- Minimum 3 disks.
- Good performance ( as blocks are striped ).
- Good redundancy ( distributed parity ).
- Best cost effective option providing both performance and redundancy. Use this for DB that is heavily read oriented. Write operations will be slow.
RAID LEVEL 10 (1+0)
Following are the key points to remember for RAID level 10.
- Minimum 4 disks.
- This is also called as “stripe of mirrors”
- Excellent redundancy ( as blocks are mirrored )
- Excellent performance ( as blocks are striped )
- If you can afford the dollar, this is the BEST option for any mission critical applications (especially databases).
RAID
RAID来至Redundant Array of Inexpensive (Independent) Disks
在大多数情况下,您将使用以下四个级别的RAID。
- RAID 0
- RAID 1
- RAID 5
- RAID 10 (also known as RAID 1+0)
这篇文章解释了这些RAID级别之间的主要区别,以及一个易于理解的图表。
在下面提及的所有图:
- A,B,C,D,E和F - 代表块/资料
- P1,P2,和p3 - 代表奇偶校验/资料结合
RAID LEVEL 5
下面是一些关键点要记住的RAID5级。
- 最少3个磁盘。
- 表现良好(块条带化)。
- 良好的冗余性(分布式奇偶校验)。
- 最佳成本效益的选择,同时提供性能和冗余。使用此DB,大量阅读导向。写操作将是缓慢的。
RAID LEVEL 5
下面是一些关键点要记住的RAID5级。
- 最少3个磁盘。
- 表现良好(块条带化)。
- 良好的冗余性(分布式奇偶校验)。
- 最佳成本效益的选择,同时提供性能和冗余。使用此DB,大量阅读导向。写操作将是缓慢的。
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