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make them parts of the kernel, you will have to rebuild the entire kernel). For RAID devices, you can choose the type of Linux software RAID devices you want to install.
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RAID is a method of storing data across several disks to provide greater performance and redundancy. In effect, you can have several hard disks treated as just one hard disk by your operating system. RAID then efficiently stores and retrieves data across all these disks, instead of having the operating system access each one as a separate file system. Lower-level details of storage and retrieval are no longer a concern of the operating system. This allows greater flexibility in adding or removing hard disks, as well as implementing redundancy in the storage system to provide greater reliability. With RAID, you can have several hard disks that are treated as one virtual disk, where some of the disks are used as real-time mirrors, duplicating data. You can use RAID in several ways depending upon the degree of reliability you need. By placing data on multiple disks, I/O operations can overlap in a balanced way, improving performance. Because having multiple disks increases the mean time between failures (MTBF), storing data redundantly also increases fault-tolerance. RAID can be implemented on a hardware or software level. On a hardware level, you can have hard disks connected to a RAID hardware controller, usually a special PC card. Your operating system then accesses storage through the RAID hardware controller. Alternatively, you can implement RAID as a software controller, letting a software RAID controller program manage access to hard disks treated as RAID devices. The software version lets you use IDE hard disks as RAID disks. Linux uses the MD driver, supported in the 2.4 kernel, to implement a software RAID controller. Linux software RAID supports five levels (linear, 0, 1, 4, and 5) whereas hardware RAID supports many more. Hardware RAID levels, such as
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TIP Before you can use RAID on your system, make sure it is supported on your kernel, along with the RAID levels you want to use. If not, you will have to reconfigure and install a RAID module for the kernel. Check the MultiDriver Support component in your kernel configuration. You can specify support of any or all of the RAID levels.
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Linux software RAID can be implemented at different levels, depending on whether you want organization, efficiency, redundancy, or reconstruction capability. Each capability corresponds to different RAID levels. For most levels, the size of the hard disk devices should be the same. For mirroring RAID 1, disks of the same size are required, and for RAID 5, they are recommended. Linux software RAID supports five levels, as shown in Table 6-1 (On Red Hat, level 4 is implemented as part of level 5).
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RAID Levels linear Capability Appending Description Simply treats RAID hard drives as one virtual drive with no striping, mirroring, or parity reconstruction. Implements disk striping across drives with no redundancy. Implements a high level of redundancy. Each drive is treated as mirror for all data. Implements data reconstruction capability using parity information. Parity information is distributed across all drives, instead of using a separate drive as in RAID 4.
6 6 6 6 6 6 6 6
Striping
Mirroring
Distributed Parity
Table 6-1.
Linux Software RAID Levels
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Linear
The Linear level lets you simply organize several hard disks into one logical hard disk, providing a pool of continuous storage. Instead of being forced to set up separate partitions on each hard drive, in effect you have only one hard drive. The storage is managed sequentially. When one hard disk fills up, the next one is used. In effect, you are appending one hard disk to the other. This level provides no recovery capability. If you had a hard disk RAID array containing two 80GB disks, after you used up the storage on one, you would automatically start on the next.
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