On 30.12.2017 15:41, Milanov, Radoslav Nikiforov wrote:
Performance as well - in my testing FileStore was much quicker than BlueStore.
with filestore you often have a ssd journal in front, this will often mask/hide slow spinning disk write performance, until the journal size becomes the bottleneck.
with bluestore only metadata db and wal is on ssd. so there is no doublewrite, and there is no journal bottleneck. but write latency will be the speed of the disk, and not the speed of the ssd journal. this will feel like a write performance regression.
you can use bcache in front of bluestore to regain the "journal+ doublewrite" write characteristic of filestore+journal.
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