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I am considering using logical volumes of an NVMe drive as DB or WAL devices for OSDs on spinning disks. The documentation recommends against DB devices smaller than 4% of slow disk size. Our servers have 16x 10TB HDDs and a single 1.5TB NVMe, so dividing it equally will result in each OSD getting ~90GB DB NVMe volume, which is a lot less than 4%. Will this cause problems down the road? This host for 145Tb data on HDDs. You'll be in agony when this NVMe will be dead.
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