NFS Services Administrator's Guide (762805-001, March 2014)

cold cache
A cache that has not yet been populated with data from the back filesystem is called cold
cache.
cache miss
An attempt to reference data that is not yet cached is called a cache miss.
warm cache
A cache that contains data in its front filesystem is called a warm cache. In this case, the cached
data can be returned to the user without requiring an action from the back filesystem.
cache hit
A successful attempt to reference data that is cached is called a cache hit.
How CacheFS works
Figure 15 displays a sample CacheFS environment.
Figure 15 Sample CacheFS Network
In the figure, cachefs1, cachefs2, and cachefs3 are CacheFS clients. The figure also displays
an NFSv4 client which is not a CacheFS client because CacheFS cannot be used with NFSv4. The
NFS server, NFSServer, shares files and the CacheFS clients mount these files as the back
filesystem.
When a user on any of the CacheFS clients, say cachefs1, accesses a file that is part of the back
filesystem, portions of the file that were accessed are placed in the local cache.
82 Configuring and administering a cache filesystem