Just a few questions re sequential I/O and the OPLOG versus the Extent Store. If the I/O is deemed sequential in nature, will this always bypass the OPLOG or only when the write operation is larger then 1MB? Does bypassing the oplog mean that the write will be a lot slower in comparison? It still hits the SSD so my assumption is that it’s going to be the same. Why does the process of coalescing the writes before sequentially draining them help with performance? I’m interested in why this step is necessary as opposed to just writing directly to the SSD and then replicating out.
Best answer by Alona
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