December 2002
Intermediate to advanced
260 pages
9h 18m
English
Content preview from Managing RAID on Linux
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Kernel 2.4
As of version 2.4, software RAID has its own subsection in the
kernel configuration (in previous versions, options were found under
the Block Devices submenu). The Multi-device Support (RAID and LVM)
submenu contains all the configuration options for software RAID. The
first option, CONFIG_MD, is a configuration switch
that reveals options for RAID and Logical Volume Management (LVM).
After selecting CONFIG_MD, choose
CONFIG_BLK_DEV_MD, which allows the kernel to
address multiple physical devices through a single logical device (see
Figure 3-1).
CONFIG_BLK_DEV_MD provides the foundation for the
md driver and needs to be enabled on every system
that uses software RAID, regardless of which RAID level is
implemented.
Figure 3-1. Enabling kernel RAID support.
In order to successfully build a software RAID device, one of the available RAID levels must also be enabled. The following kernel directives enable support for specific RAID levels:
CONFIG_MD_LINEAR CONFIG_MD_RAID0 CONFIG_MD_RAID1 CONFIG_MD_RAID5
CONFIG_MD_LINEAR and
CONFIG_MD_RAID0 enable support for the non-RAID
methods of disk grouping supported by the Linux kernel.
CONFIG_MD_RAID1 provides support for data
redundancy through disk mirroring. Finally,
CONFIG_MD_RAID5 enables support for both RAID-4 and RAID-5 layouts. The choice between using RAID-4 or RAID-5 is made later, when creating an array. If you plan to experiment ...
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