I am also interested, especially from the point of view of application level support for fast failover.
We have a tested home-grown solution to rehost our production site onto a backup platform, without a reboot.
We are also looking at HA/XD, but expect that applevel support is required to do more for us than we are doing for ourselves now.
We have thoroughly tested our failover (rehosting) mechanism on our test site, and are planning to go live on a new p615 running AIX 5.2L and Platform 5.3 (zero rev?)
