All three questions have pretty much the same answer: you rebooted. Only the files finished installing when it showed complete, there is still a lot of work to after that. Expect it to take over an hour on a production system. There are several reboots the system does automatically. Never manually reboot during an upgrade, unless support explicitly tells you to.
Ok I understand that. The main problem here was that my customer when he lost comunication with the appliance he did the manually reboot.
This is the first time that I am expecting this kind of problems. I will recommend to do not do manually reboots
One last question.... why takes a long time to install HF6? I mean... in other appliances takes just 30 minutes and others take 1 hour ?
The loss of commumication was likely between some of the reboots performed by the system. I would expect it on every installation of HF6.
Hotfix 6 may have been better called a complete new version. It makes the transition from 32 to 64 bit OS and upgrades most every package on the system. During the upgrade the database is rewritten, and all files on the disk are backed up. The more mail the systems sees or has in quarantine, the longer the upgrade will take.