On Sat May 4 00:18:46 EDT 2013, cinap_len...@gmx.de wrote: > cwfs copies the blocks from worm into the cache on read. > so the working set is served from the ssd and the ram > buffer cache. reading /n/dump would hit the mechanical > disk tho.
that's an option for ken's fs. i haven't found that it's fast enough because the latency to retrieve a block that's not in the cache is the latency for read(worm)+read(cachebkt)+ write(cache). if one keeps the cache small, the read of the cachebkt goes away. therefore it's best to keep cachesize << wormsize. - erik
