Sorry for the not inline reply. If you can get 6 OSD’s per a NVME as long as your getting a decent rated NVME your bottle neck will be the NVME but will still improve over your current bottle neck.
You could add two NVME OSD’s, but their higher performance would be lost along with the other 12 OSD’s. ,Ashley Sent from my iPhone On 23 Jun 2017, at 8:34 PM, Massimiliano Cuttini <[email protected]<mailto:[email protected]>> wrote: Hi Ashley, You could move your Journal to another SSD this would remove the double write. If I move the journal to another SSD, I will loss an available OSD, so this is likely to say improve of x2 and then decrease of x½ ... this should not improve performance in any case on a full SSD disks system. Ideally you’d want one or two PCIe NVME in the servers for the Journal. This seems a really good Idea, but image that I have only 2 slots for PCIe and 12 SSD disks. I image that it's will not be possible place 12 Journal on 2 PCIe NVME without loss performance..... or yes? Or if you can hold off a bit then bluestore, which removes the double write, however is still handy to move some of the services to a seperate disk. I hear that bluestore will remove double writing on journal (still not investigated), but I guess Luminous will be fully tested not before the end of the year. About the today system really don't know if moving on a separate disks will have some impact considering that this is a full SSD disks system. Even adding 2 PCIe NVME.... why should not use them as a OSD instead of journal solo?
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