Hi Claas,

which type of SSD are you using? If these are enterprise-grade NVMe SSDs, there 
is a good chance they support multiple namespaces. In that case, i would 
suggest to create 4 namespaces per SSD (you might consider more, depending on 
your load, available CPU cores and type of SSD) and deploy 1 OSD per namespace. 
Namespaces save you from all the additional complexity around multiple OSD per 
SSD, as each namespace will show up as a separate SSD from ceph point of view. 
E.g. /dev/nvme0n1, /dev/nvme0n2, /dev/nvme0n3…

Cheers 
Gregor

> On 6. Mar 2023, at 11:59, claas.go...@contact-software.com wrote:
> 
> This post took a while to be checked from a moderator and meanwhile I found a 
> Service rule, that fetched all my available diskes. I deleted it and after 
> that, all commands works as foreseen.
> 
> Thanks to all for reading.
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