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TheLinuxGurus.org: Creating Disk Arrays with the 2.4 Kernel

Mar 26, 2001, 10:42 (3 Talkback[s])
(Other stories by F. William Lynch)

[ Thanks to David Culp for this link. ]

"One of the more exciting, yet least hyped features of the new 2.4 kernel is the built-in facility for handling software RAID arrays. In the not-so-olden days of the 2.2 series kernels, one had to manually add a number of specific patches as discussed on www.linuxraid.org. The new 2.4 kernel distribution includes all of the latest software RAID enhancements, currently stable at version 0.9. This writing is intended to serve as a tutorial for creating such software RAID arrays."

"It should be noted that Linux can handle software RAIDs using either SCSI or IDE devices (or both, as will be demonstrated in this tutorial). When creating RAID arrays from IDE devices it is recommended that one use only one device per IDE controller because if the controller itself fails, it will most likely take both IDE disks down with it. Even fault tolerant RAID levels such as 1 and 5 cannot handle losing multiple devices simultaneously, at least not without administrative intervention."

"The IDE hardware used for this tutorial's research included a Western Digital Caviar 2700 (700MB) disk, a Western Digital Caviar 32500 (2.5GB) disk and a Promise Ultra66 PCI IDE controller. For the example setup, one disk is located as the master device on the secondary IDE controller on the motherboard (Tyan Trinity ATX) and the other is the master device on the first channel of the Ultra66. These drives are devices hdc and hde under Linux, respectively. For SCSI hardware, this system consisted of a Quantum XP31070L (1.0GB) SCSI disk on a Tekram DC-390F controller. The SCSI disk was was device sda under Linux."

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