User manual

Cache setup
Cobalt CacheRaQ 4 User Manual 37
Figure 19 shows a parent/child configuration of cache servers.
Figure 19. Parent/child configuration
In addition to the parent-child relationships, the CacheRaQ 4 supports the notion
of siblings. Siblings are cache servers at the same level in the hierarchy, provided
to distribute cache server load. Each cache in the hierarchy independently decides
whether to fetch the reference from the object’s home site or from parent or
sibling caches, using a simple resolution protocol. Siblings do not fetch an object
for another sibling to resolve a cache “miss”.
Figure 20 shows a sibling configuration of cache servers.
Figure 20. Sibling configuration
Parent
Child
Child
Child
Sibling
Sibling
Sibling
Sibling