As Website availability is increasingly seen as
a must, Website owners need to invest resources to reduce down time to a minimum. To
that end, several technologies have been developed over the past years and probably some
others will appear soon.
Big companies usually solve the availability problem with large investments in hardware,
software, and personnel that can be prohibitive for medium and small businesses. That is one
of the reasons why small companies usually lack a real highly-available solution. Most of
them just blindly rely on their Internet providers. Internet providers host Websites on shared
or dedicated servers running, in the best case, on high-end computers with replicated disks
and uninterruptible power supplies. Availability is ???guaranteed??? by the hardware quality they
provide for the Website, by the quality of their Internet connection, and by manual intervention
in case of crashes. Even though this common solution may seem enough for a wide
range of Websites, there are many others that cannot afford the potential downtime. These
increasingly greater numbers of small companies do need an affordable true highly-available
solution. Unfortunately, high-availability concerns are only perceived when unavailability
appears.
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