There are also some smaller players. Plasmon offers CAS with optical disk, and optical disk has its pluses and minuses for active archive uses. Nexsan has some traction with its Assureon product, which provides a good entry-level product for SMBs.
Caringo, a startup that is lead by the original CAS inventors that worked for FilePool when EMC acquired FilePool, offers a software-based platform that can run on commodity server hardware. But interestingly enough, most of the competition we see when Centera is involved in a deal comes from block network-attached storage (NAS), such as NetApp or Sun.
Check out the entire CAS FAQ.
This was first published in June 2008