[Linux-cluster] Does GFS work well with hybrid storage devices?

["Lin Shen \(lshen\)" <lshen cisco com>]

Will GFS work well in a cluster system that hosts a wide range of
storage 
devices such as disk array, hard disk, flash and USB devices? Since
these 
devices have very different performance and reliability behaviors, it
could be 
a challenge for any CFS, right?
 
I read from somewhere that GFS doesn't support multiple writers on the
same file
simutaneously. Is this true?
 
Lin Shen
 
Cisco Systems