pvcreate to memory

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hi
is there a way to create vgda information to memory?

I want to create a virtual LVM disk
We have all the cow data on a disk, but 
# lvconvert -s vg/lv /dev/mydisk
doesn’t accept the path to the disk device
and if I create a symbolic disk in /dev/vg/mydisk of in /dev/mapper/vg—mydisk pointing to /dev/mydisk
the ‘lvconvert’ command doesnt accept the cow data on the disk
so I guess that the VGDA data has to be present on the disk in order for the lvconvert command to accept the data
what do you think could be missing?
is it the vgda meta data on the disk?

if so, how can I create and emulate the vgda data so that the lvconvert command works?

thanks in advance 
regards Tomas

Sent from my iPhone


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