CRFS and POHMELFS vs pNFS
Posted Feb 9, 2008 22:36 UTC (Sat) by giraffedata
In reply to: CRFS and POHMELFS
Parent article: CRFS and POHMELFS
There is also the newer, more vaporous pNFS effort.
That doesn't seem to do cache coherency to enable more aggressive local cache in clients, but
instead looks like an effort to allow multiple servers to serve the same piece of data to
increase data throughput. Am I right?
pNFS is neither of those. It is about distributing the filesystem over multiple servers to increase throughput. A particular piece of data comes from one server, but 3 pieces of data might come from 3 different servers, so you can access all 3 at the same time.
And it achieves that by separating serving of raw file data from the more complex filesystem operations -- they're done by separate servers. That presents unique cache coherency problems, so might make it look like pNFS is about cache coherency.
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