when i reinstalled (after running ./install -u) with command
./install.sh --cluster active --platform-override
it insisted on shutting down zimbra
You appear to be installing packages on a platform different
than the platform for which they were built.

This platform is CentOS5_64
Packages found: RHEL5_64
This may or may not work.

Using packages for a platform in which they were not designed for
may result in an installation that is NOT usable. Your support
options may be limited if you choose to continue.

Install anyway? [N] y

The system will be modified.  Continue? [N] y

Shutting down zimbra mail
I'm reinstalling a active cluster node while another active cluster node a and a standby node are running