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2013 Feb 20
7
Hybrid Storage proposal
...ften used bulk data on SSDs. We prioritize data that is often accessed randomly, while larger bulk operations are kept on bulk storage. Recent development in Linux SSD caches, uses a block IO approach to solve caching. The approach assumes that data is stable on disk and evicts data based on LRU, temparature, etc. This is great for read only IO patterns and in-place writes. However, btrfs uses a copy on write approach, that reduces the benefits of block IO caching. The block caches are unable to track updates (require extensive hints forth and back between the cache layer). Additionally, data and m...