dmcrypt is part of the whole device-mapper infrastructure :
https://en.wikipedia.org/wiki/Device_mapper

LVM is nothing but a tool to manipulate device-mapper easily

I do not see any reason for using dmcrypt directly without LVM

On 06/02/2018 11:24 AM, Marc Roos wrote:
> 
>>> I would like to try this disk encryption without lvm. 
>>
>>> And then have ceph use this device dmcrypt device
>>
>> You know that dmcrypt and LVM are tightly linked, right ?
> 
> No I did not. What makes this tightly linked relevant?
> 

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