If package yast2-storage-evms is installed, some YaST modules hang upon startup.   
The last lines in y2log are:   
   
2005-09-21 16:24:46,144 INFO  libstorage - Container.cc(Container):25 constructed   
cont md   
2005-09-21 16:24:46,144 INFO  libstorage - MdCo.cc(MdCo):21 constructing MdCo   
detect:1   
2005-09-21 16:24:46,144 INFO  libstorage - AsciiFile.cc(loadFile):48 Loading   
File:"/etc/raidtab"   
2005-09-21 16:24:46,144 INFO  libstorage - AsciiFile.cc(loadFile):48 Loading   
File:"/etc/mdadm.conf"   
2005-09-21 16:24:46,144 INFO  libstorage - MdCo.cc(getMdData):85 begin   
2005-09-21 16:24:46,144 INFO  libstorage - MdCo.cc(~MdCo):36 destructed MdCo   
2005-09-21 16:24:46,145 INFO  libstorage - Container.cc(~Container):34 destructed   
cont /dev/md   
2005-09-21 16:24:46,145 INFO  libstorage - SystemCmd.cc(SystemCmd):27   
Konstruktor SystemCmd:"vgdisplay -s" Nr:0   
2005-09-21 16:24:46,145 INFO  libstorage - SystemCmd.cc(execute):96 SystemCmd   
Executing:"vgdisplay -s"   
2005-09-21 16:24:46,152 INFO  libstorage - SystemCmd.cc(addLine):561 Adding Line   
1 "/bin/sh: vgdisplay: command not found"   
2005-09-21 16:24:46,152 INFO  libstorage - SystemCmd.cc(getUntilEOF):527   
pid:30267 added lines:1 stderr:1   
2005-09-21 16:24:46,153 INFO  libstorage - SystemCmd.cc(doExecute):241 system()   
Returns:127   
2005-09-21 16:24:46,153 INFO  libstorage - SystemCmd.cc(logOutput):572   
stderr:/bin/sh: vgdisplay: command not found   
2005-09-21 16:24:46,153 INFO  libstorage - LvmVg.cc(getVgs):866 detected Vgs <>   
2005-09-21 16:24:46,153 INFO  libstorage - EvmsCo.cc(activate):966 old active:1   
val:1   
2005-09-21 16:24:46,153 INFO  libstorage - EvmsCo.cc(sendCommand):984 cmd:list   
fd:5   
   
   
Uninstalling yast2-storage-evms fixes this problem.  
Affected YaST modules are the software installation ("yast2 -i") and thus of  
course all YaST modules that call "yast2 -i" to install additional components.  
YOU is not affected.  
  
  
Summarizing a personal discussion (fehr + sh) there seems to be disagreement if 
this is a problem that needs to be addressed: yast2-storage-evms is not part of 
any software selection, so it is not installed by default or even by adding any 
software selections, but the package is there on the installation media, so 
users are free to select it for installation, even without any kind of warning. 
Thus it is a perfectly legal scenario for users to run into this problem. 
 
I consider this problem a showstopper for the great majority of all users - 
whoever will install this package will find many YaST modules unusable 
afterwards without any hint what happened or what to do to fix that problem. 
 
We should try to add some safety check to that package or to the respective 
function call to avoid that kind of hanging. If that is not possible, we need at 
least an installation notify message informing users who try to install that 
package.