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. Metadata footprint Each log layer needs to store metadata to keep track of physical addresses as they append new data. Many log layers support multiple append streams, which, they discovered, has important negative effects on the lower log. File system write amplification could increase by much as 33% as the number of append streams went from 2 to 6. Fragmentation When two log layers do garbage collection, but at different segment sizes and boundaries, the result is segment size mismatch, which creates additional work for the lower layer. When the upper layer cleans one segment, the lower layer may need to clean to two segments. Reserve capacity over-consumption Each layer’s garbage collection requires consumption of reserve capacity.
Stack the GC layers and more storage is used. Multiple append streams Multiple upper layer append streams – useful for segregating different application update frequencies – can cause the lower log to see more data fragmentation. Layered garbage collection Each layer’s garbage collection runs independently, creating multiple issues, including:.
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Layered TRIMs. TRIM at the upper layer doesn’t reach the lower layer, so the lower layer may have invalid data it assumes is still valid. GC write amplification. Independent GC can mean the lower layer cleans a segment ahead of the upper layers, causing re-writes when the upper layer communicates its changes. Courteous comments welcome, of course.