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Ramdisks and hard drives as cache devicesRamdisks and hard drives as cache devicesPosted Jul 20, 2010 11:38 UTC (Tue) by neilbrown (subscriber, #359)In reply to: Ramdisks and hard drives as cache devices by jlayton Parent article: Bcache: Caching beyond just RAM
Yes, NFSv3 helps with writing large files. But metadata operations (create, unlink, chmod, mv) still need to be synchronous and some workloads can be very metadata-heavy (untar is a good example, 'make' on a big project tends to delete and create lots of relatively small files too).
So a low-latency cache can definitely improve the performance of an NFS server.
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Ramdisks and hard drives as cache devices Posted Jul 22, 2010 20:59 UTC (Thu) by nix (subscriber, #2304) [Link]
Unfortunately if you want to spot cache invalidations, the lack of leases on NFSv3 is a killer, because you still have to roundtrip to the server to see if your cache is stale, and roundtrips are the slow part :( fs-cache slows NFS *down* quite considerably in my experience, for exactly this reason.
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