upgrade

[Rail mail]

moved from slowlaris to freebsd for a web server. it is in a
production environment.

will a binary upgrade catch all the security updates? should I expect
anything to break? (at least web server, ftp and ssh)

besides time and effort, how does cvsup and build world compare to
binary upgrade?

should I run the upgrade from sysinstall from disk, or throw in a cd
and use that sysinstall?

the quick and dirty of the system is
running 5.1 on a dual xeon, hot swap scsi disks, tape drive

thanks