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RAID Levels
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In this section, you will learn about the most common RAID levels: how they work, what fault tolerance they provide, and how quickly they perform. There are other RAID levels that are rarely used; only the most popular ones will be mentioned.
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RAID-0
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RAID-0 is the most basic RAID level, offering disk striping only. A chunk is created on each disk drive, and the controller defines the size of the chunk. As Figure 4-6 illustrates, a round-robin method is used to distribute the data to each chunk of each disk in the RAID-0 array to create a large logical disk. Although RAID-0 is considered a RAID level, technically, there is no redundancy at this level. Because there is no redundancy, there is no fault tolerance. If any disk fails in a RAID-0 array, all data is lost. The loss of one disk is similar to losing every fourth word in this book. With this portion of the data missing, the array is useless.
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I/O Subsystem Planning and RAID Configuration
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Figure 4-6
RAID-0.
RAID-0 Recommendations RAID-0 is not normally recommended for storing SQL Server data files. Because the data in the database is so important to your business, losing that data could be devastating. Because a RAID-0 array does not protect you against a disk failure, you shouldn t use it for any critical system component, such as the operating system, a transaction log, or database files.
Note
A disk drive spins at a high rate and operates at a high temperature. Because the disk is a mechanical component, it eventually will fail. Thus, it is important to protect SQL Server data files from that failure by creating a faulttolerant system and by performing proper backups.
Real World
Long Live the Disk Drive
According to our specifications above, our typical 73-GB disk drive has a MTBF of 1,400,000 hours. My first question to the disk drive vendors is How can you tell My next question is Who is going to run a disk drive for 159 years I guess my 10year-old 5 MB (yes MB) disk drive should still be useful. Check back in 149 years, and I ll let you know if it s still working. The problem is that this average arises from the fact that most disk drives will never fail, but some will fail during the first few days of operation. My experience is that most failures occur during the first few weeks of operation or when the drives have been running for a long time and are shut down for a few days. In cases in which disk drives are running for long periods of time, I don t recommend shutting them down for any reason.
Part II
System Design and Architecture
RAID-1 and RAID-10
RAID-1 is the most basic fault-tolerant RAID level. RAID-1, also known as mirroring, duplicates your data disk. As Figure 4-7 shows, the duplicate contains all of the information that exists on the original disk. In the event of a disk failure, the mirror takes over; thus, you lose no data. Because all the data is held on one disk (and its mirror), no striping is involved. Because RAID-1 uses the second disk drive to duplicate the first disk, the total space of the RAID-1 volume is equal to the space of one disk drive. Thus, RAID-1 is costly because you must double the number of disks but you get no additional disk space in return. However, you do get a high level of fault tolerance.
Disk 1
Disk 1 Mirror
Figure 4-7
RAID-1.
For a RAID-1 volume, an I/O operation is not considered complete until the controller has written data to both disk drives. Until that happens, a fault (disk failure) cannot be tolerated without loss of data. Once that data has been written to both disk drives, the data can be recovered in the event of a failure in either disk. This means that if writing the data to one disk takes longer than writing the same data to the other disk, the overall latency will equal the greater of the two latencies.
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