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IBM developerWorks: Common threads: Software RAID in the new Linux 2.4 kernel

Feb 09, 2001, 17:31 (0 Talkback[s])
(Other stories by Daniel Robbins)

[ Thanks to Frank for this link. ]

"The new 2.4 kernel is out! So it's time to track down a spare PC, put Linux on it, and see what it can do. In his three-part series on the Linux 2.4 Software RAID, Daniel Robbins introduces the new technology that's used to increase disk performance and reliability by distributing data over multiple disks. This first installment covers Software RAID setup (kernel and tools installation) and shows you how to create linear and RAID-0 volumes."

"The new kernel has a number of nifty new features and additions. One of these is the inclusion of a modern Software RAID implementation -- yay! Software RAID allows you to dramatically increase Linux disk IO performance and reliability without buying expensive hardware RAID controllers or enclosures. Because it's implemented in software, Linux RAID software is flexible, fast... and fun!"

"The concept behind Software RAID is simple -- it allows you to combine two or more block devices (usually disk partitions) into a single RAID device. So let's say you have three empty partitions, hda3, hdb3, and hdc3. Using Software RAID, you can combine these partitions and address them as a single RAID device, /dev/md0. md0 can then be formatted to contain a filesystem and used like any other partition. There are also a number of different ways to configure a RAID volume -- some maximize performance, others maximize availability, while others provide a mixture of both."

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