Is RAC really HA on Linux

i hope i addressed this right - its my first post.
i am looking at RAC to provide an HA environment on Linux (most likely 
Redhat AS3)

assuming we dont want to use raw file system, are my only options OCFS or 
OCFS with ASM (my understanding is that even with ASM we still need OCFS 
for the CRS part).

what about Redhat's GFS? - is that certified for RAC? i've tried to find 
info on this at metalink but they refer to something called 'Oracle OSD 
Clusterware' - whatever that is.

i'm also VERY concerned about true HA. Can we have one linux machine down 
in the cluster so that we can upgrade all or any of the moving parts (ie 
ASM; OCFS; CRS; RAC; Linux etc) - or do they all need to be at the same 
version for the cluster to operate?

or for improved HA (ie less upgrades) are we safer going with raw?

i'm going to pose these same questions in a tar to oracle, but thought i'd 
ask here first

thanks in advance,

steve



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