Hi, I have an existing Luminous installation, 3 nodes with 8x4TB HDD and a 1x200GB SSD which was used as journal before. On a default Luminous installation via ceph-deploy, I forgot to prepare the OSD with the WAL and DB on separate SSD. The environment is running and in production and I want to configure it to use the SSD as the WAL device or maybe for DB also, since the environment is in production I am hesitant to do it because it may cause some problems along the way. What should I do for me to reconfigure it without downtime, or if there are downtime at least minimal? ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF -1 101.86957 root default -3 29.10559 host ceph01 0 hdd 3.63820 osd.0 up 1.00000 1.00000 1 hdd 3.63820 osd.1 up 1.00000 1.00000 2 hdd 3.63820 osd.2 up 1.00000 1.00000 3 hdd 3.63820 osd.3 up 1.00000 1.00000 4 hdd 3.63820 osd.4 up 1.00000 1.00000 5 hdd 3.63820 osd.5 up 1.00000 1.00000 6 hdd 3.63820 osd.6 up 1.00000 1.00000 7 hdd 3.63820 osd.7 up 1.00000 1.00000 -5 29.10559 host ceph02 8 hdd 3.63820 osd.8 up 1.00000 1.00000 9 hdd 3.63820 osd.9 up 1.00000 1.00000 10 hdd 3.63820 osd.10 up 1.00000 1.00000 11 hdd 3.63820 osd.11 up 1.00000 1.00000 12 hdd 3.63820 osd.12 up 1.00000 1.00000 13 hdd 3.63820 osd.13 up 1.00000 1.00000 14 hdd 3.63820 osd.14 up 1.00000 1.00000 15 hdd 3.63820 osd.15 up 1.00000 1.00000 -7 29.10559 host ceph03 16 hdd 3.63820 osd.16 up 1.00000 1.00000 17 hdd 3.63820 osd.17 up 1.00000 1.00000 18 hdd 3.63820 osd.18 up 1.00000 1.00000 19 hdd 3.63820 osd.19 up 1.00000 1.00000 20 hdd 3.63820 osd.20 up 1.00000 1.00000 21 hdd 3.63820 osd.21 up 1.00000 1.00000 22 hdd 3.63820 osd.22 up 1.00000 1.00000 23 hdd 3.63820 osd.23 up 1.00000 1.00000 - Vlad ᐧ