?12c?cluster?????????????,?????????????flex cluster?flux asm?? ??Hub Node?Leaf Node,?????Hub Node?Leaf Node.
Hub Node????:
A node in and Oracle Flex Cluster that is tightly connected with other servers and has direct access to a shared disk.
Leaf Node????:
Servers that are loosely coupled with Hub Nodes, which may not have direct access to the shared storage.
?????????? Leaf Node??????shared storage ,????leaf node??share disk?? ??Hub Node?12c?????cluster node???, ?Leaf Node?????
Leaf Node???:
? Hub Node?? ?????cluster??
????????Hub Node
????Hub Node?????
Hub Node????????????Leaf Node???
???????????
?Hub Node?????
??Leaf Node??Flex Cluster???????:
hub-and-spoke???cluster??????????
????Hub Node????OCR?Votedisk
????HUB node???,???????clusterware?????,??ocr?Votedisk ?
??????????????
??????????,????????
????????,12???Flex cluster??12?????, ???????? [ n * (n-1)]/2?66??????
???1000?????,?????????????40?Hub Node,???Hub Node??24?Leaf Node,?Flex Cluster???1740?????? ????,??Cluster??499500??????
?Flex Cluster??????????????,??cluster software?????
??Hub Node ??
????????? , ??????????relocate???Hub Node
?Hub Node???Leaf Node??????,????????relocate???Leaf Node?
??Leaf Node??
?????????,????????relocate????Leaf Node?