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However, if you switch to faster drives, Bluestore's random writes don't appear to be much better than Filestore's. This shows up differently in HDD+SSD and All-Flash setups both of which are certainly very popular.

Filestore writes everything to the journal and only starts to flush it to the data device when the journal fills up to the configured percent. This is very convenient because it makes journal act as a «temporary buffer» that absorbs random write bursts.