SANmelody maybe a cheap solution. But well designed and for example with local sas arrays more then fast. I have setup more than one system at various customers. medical, finance, etc... all works perfect and as fast than all high-end EMC Products. Don't forget. You can use FC 4GB, you can use "fast" SAN technology as storage backbones....
Doubletake was tested in our test
environment, it suited well as a hot stand by service
for vm's that not function anymore. The replicated
vm's took over ip, hostname in case of disaster. So
it is kind of cluster software.
I haven't seen any production environments configured
with this setup.
Hope this is of any help,
bkTo my understanding Sanmelody and Doubletake are two
different products: Sanmelody is a cheap SAN
solution, good for testing and small ESX environments
(education centres etc.).
Doubletake is replication software for building a
safe backup and disaster recovery solution.
Sanmelody was running in our education centre and the
performance was not optimal but good enough for its
purposes.
