EOF of Cache FileSystem (cachefs) [PSARC/2008/478 FastTrack timeout

[Jorgen Lundman]

Sorry for the lateness of this reply.

We only use cachefs in the www cluster, to take load off the x4500s. Since it is read-only data, to be served with Apache it is saving quite a lot of load for the NFS servers.

There are some issues, the first access seems to be rather slow, but any following access is fast.

It performs rather well:


    /export/www
                 cache hit rate:    99% (137652152 hits, 14792 misses)
             consistency checks: 1970413 (1970088 pass, 325 fail)
                       modifies:      0
             garbage collection:      0


iostat reports NFS bandwidth at 0-1%, but HDD IO is constantly at 100%. I would have preferred the ability to lower the amount of caching and hit 20/80% but I do not think I can.

We have to use NFS3, and NFS4 will not let us keep unmapped uids. If we do not use cachefs the x4500's nfsd hits 1024 thread and die.  So without cachefs, we will need a different solution.
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