So i created the brick without the cache an add the cache doing the commands 
below; but it appers it's not working because I see no improvement in the 
benchmarks. 

pvcreate /dev/md/VMStorageHot
vgextend RHGS_vg_VMStorage /dev/md/VMStorageHot
lvcreate -L 1500G -n lv_cache RHGS_vg_VMStorage /dev/md/VMStorageHot
lvcreate -L 100M -n lv_cache_meta RHGS_vg_VMStorage /dev/md/VMStorageHot
lvconvert --type cache-pool --cachemode writeback --poolmetadata 
RHGS_vg_VMStorage/lv_cache_meta RHGS_vg_VMStorage/lv_cache
lvconvert --type cache --cachepool HGS_vg_VMStorage/lv_cache 
RHGS_vg_VMStorage/VMStorage_lv_pool
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