RAID5 support in the MD driver has been part of mainline Linux since
2.4.0 was released in early 2001. During this time it has been used
widely by hobbyists and small installations, but there has
been little evidence of any impact on the larger or "enterprise"
sites. Anecdotal evidence suggests that such sites are usually
happier with so-called "hardware RAID" configurations where a purpose-built
computer, whether attached by PCI or fibre channel or similar,
is dedicated to managing the array.
This situation could begin to change with the 4.4 kernel, which brings some
enhancements to the MD driver that should make it
more competitive with hardware-RAID controllers.
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