Resize Bluestore i.e. shrink?

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Hi all,

I'm currently building a little ceph-cluster, with embedded devices. My
OSD Nodes are constrained in RAM (1GB, but 5 SATA Ports, please don't
kill me ;) ). Anyways. Each of those nodes have 2x256 GB SSD and 2x 1TB
HDDs.

I'm using nautilus and deployd the whole thing with ceph-deploy. Now,
I'd like to add more mem (a.k.a SWAP space, as raid1 on either
ssds/hdds) to those OSDs.

My question is: Can I shrink a bluestore lvm?
I've seen 'ceph-bluestore-tool bluefs-bdev-expand' which suggests to
expand the underlying lvm.

It seem to me that I would have to remove the specific OSD and then add
it manually after resizing the underlying lvm volume.

And yes, I know that ceph need RAM ;)
Cheers,
udo.

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