Hey guys,

I’m struggling with the ceph-volume command in nautilus 14.2.6. I have 12 disks 
on each server,  3 of them ssds (sda,sdb,sdc) and 9 spinning disks (sdd .. 
sdl). Initial deploy witch ceph-volume batch works fine, one ssd is used for 
wal and db for 3 spinning disks. But running the ‘ceph-volume lvm batch 
--report /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg 
/dev/sdh /dev/sdi /dev/sdj /dev/sdk /dev/sdl’ after the initial deploy I get 
'Aborting because strategy changed from bluestore.MixedType to 
bluestore.SingleType after filtering'

Looking at /var/log/ceph/ceph-volume.log I see:
[ceph_volume.devices.lvm.batch][INFO  ] Ignoring devices already used by ceph: 
/dev/sdd, /dev/sde, /dev/sdf, /dev/sdg, /dev/sdh, /dev/sdi, /dev/sdj, /dev/sdk, 
/dev/sdl

I do understand that before filtering I have MixedType (ssd + sata) and after 
filtering (only ssds left) it is single type. So the error message is correct.

But why does ceph-volume filter out the spinning disks with data partitions but 
not the ssds with wal/db? Is this intended?

Regards Felix


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