The following companies provide (or are in the process of providing) commercial
High-Availability software or capabilities for Linux:
provides RSF-1 (Resilient Software Facility - 1). RSF-1 is available on every major
Linux distribution, and provides agents for many popular software packages,
and supports clusters of up to 64 nodes.
High-Availability product for Linux.
application recovery kits for Oracle, Informix, Apache and Sendmail.
North Fork Network's SANi.q.
product combines with inexpensive hardware (IDE/SCSI disks, Ethernet
networks) to create scalable, fault-tolerant, and easy-to-manage
Storage Area Networks. An evaluation copy is available from their
Clustra's core product, the Clustra Database, is a zero-downtime,
relational SQL database.
Twincom's Network Disk Mirror
a commercial product similar in function to the NBD+RAID1 open source
solution, but already neatly packaged up for you.
It seems like it would work well as a Linux-HA resource, or in combination
with some other commercial package.
Fujitsu Siemens Computers has
the availability of their
(Reliant Monitor Software)
High-Availability software for Linux.
RMS seems similar to a combination of the freely available heartbeat and
is an Apache-Module that creates High Availability
for this webserver throug a Master/Slave-Mechanism. As soon as
the Slave notices that the Master is not available anymore,
it takes over the IP-Address and the webservice automatically.
It is commercial Software, but a free 30-day evaluation license
is available directly from the website.
Mod_redundancy looks a lot like a subset of the freely
available heartbeat package.
Reflective Memory is a high-speed, real-time, deterministic network.
With Reflective memory, each node on the network has a local copy of
shared data. The act of writing the reflective memory causes the
local data on all the nodes to be updated.