[ceph-users] bluestore worries

Hi all, I am thinking about converting a Filestore cluster to Bluestore. The OSD nodes have 16X4TB 7200 SATA OSDs with NVME write journals. The NVME drives should be large enough to house ~30G DB/WAL OSDs. I am worried that I will see a significant performance hit when the deferred writes to the NVME journals are eliminated with Bluestore. Has anyone converted a similar setup to Bluestore? If so, what was the performance impact. thx Frank