[Gluster-users] Replication Options?

[Jeff Lord]

I am wondering what the difference between these two might be?

volume replicate
  type cluster/replicate
  subvolumes gfs01-hq.hq.msrch gfs02-hq.hq.msrch
end-volume

volume replicate
  type cluster/afr
  subvolumes gfs01-hq.hq.msrch gfs02-hq.hq.msrch
end-volume

Couldn't seem to find anything in the docs that mentioned this. Is  
there something i might have missed?

thanks,

jeff