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the RAID levels you want to use If not, you will have to reconfigure and install a RAID module for the kernel Check the Multi-Driver Support component in your kernel configuration You can specify support for any or all of the RAID levels
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With kernel 26, hardware RAID devices are supported with the Device-Mapper Software RAID support tool (dmraid), which currently supports a wide range of motherboard RAID devices Keep in mind that many hardware RAID devices are, in effect, really software RAID (fakeraid) Though you configure them in the motherboard BIOS, the drivers operate as software, like any other drivers In this respect they could be considered less flexible than a Linux software RAID solution, and they could also depend directly on vendor support for any fixes for updates The dmraid driver will map your system to hardware RAID devices such as those provided by Intel, Promise, and Silicon Magic, and often included on motherboards The dmraid tool uses the device-mapper driver to set up a virtual file system interface, just as is done for LVM drives The RAID device names will be located in /dev/mapper You use your BIOS RAID configuration utility to set up your RAID devices as instructed by your hardware documentation During a Linux installation, the RAID devices are automatically detected and the dmraid module is loaded, selecting the appropriate drivers With the dmraid command you can detect and activate RAID devices The following command displays your RAID devices:
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To list currently supported devices, use dmraid with the -l option
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PART VII PART I PART I PART I PART I PART I PART I
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The dmraid tool is improved continually and may not work well with some RAID devices
Linux Software RAID Levels
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 for 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 30-2 RAID 5 requires at least three hard drives
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 have a hard disk RAID array containing two 80 GB disks, after you use up the storage on one, you will automatically start on the next
RAID Level Linear 0 1 5
Capability Appending Striping Mirroring Distributed parity
Description 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 Requires at least three hard drives or partitions Implements data reconstruction capability using dual distributed parity information Dual sets of parity information are distributed across all drives Can be considered an enhanced form of 5 Supports multiple access to the same device
Distributed parity
Multipath
Multiple access to devices
TABLE 30-2 Linux Software RAID Levels
Part VII:
System Administration
RAID 0: Striping
For efficiency, RAID stores data using disk striping, where data is organized into standardized stripes that can be stored across the RAID drives for faster access (level 0) RAID 0 also organizes your hard disks into common RAID devices but treats them like single hard disks, storing data randomly across all the disks If you had a hard disk RAID array containing two 80 GB disks, you could access them as one 160 GB RAID device
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