[tahoe-dev] dirnode root/leaf depth (was: Benchmark and scaling figures and how to lockdown a tahoe-lafs grid...)

[Nathan Eisenberg]

> Even with 40 machines, you shouldn't run into any issues with
> scalability from a performance perspective.  The commercial allmydata
> site had far more than that.

You know, thinking about this - why should directories not be K=1, M=$numservers?  This would seem to be very roughly akin to a distributed MFT?  Surely this data doesn't consume a significant amount of storage?  For larger clusters, this could curve downwards - for grids with more than 3 nodes, M=$numservers*.75, for grids with more than 10 nodes, M=$numservers*.50, for grids with more than 50 nodes, M=$numservers*.25, etc.  Since dirnodes are vital for the accessibility of all of their leaves, doesn't it makes sense to make them far more available than any single leaf?

Or, alternatively, designate a new node type - a node that is specifically dedicated to dirnodes?

Best,
Nathan Eisenberg