Hi,
if you deploy OSDs from scratch you don't have to create LVs manually,
that is handled entirely by ceph-volume (for example on cephadm based
clusters you only provide a drivegroup definition). I'm not sure if
automating db/wal migration has been considered, it might be (too)
difficult. But moving the db/wal devices to new/different devices
doesn't seem to be a reoccuring issue (corner case?), so maybe having
control over that process for each OSD individually is the safe(r)
option in case something goes wrong.
Regards,
Eugen
Zitat von Christian Rohmann <christian.rohmann@xxxxxxxxx>:
Hey ceph-users,
I was wondering if ceph-volume did anything in regards to the
management (creation, setting metadata, ....) of LVs which are used
for
DB / WAL of an OSD?
Reading the documentation at
https://docs.ceph.com/en/latest/man/8/ceph-volume/#new-db is seems
to indicate that the LV to be used as e.g. DB needs to be created
manually (without ceph-volume) and exist prior to using ceph-volume
to move the DB to that LV? I suppose the same is true for
"ceph-volume lvm create" or "ceph-volume lvm prepare" and "--block.db"
It's not that creating a few LVs is hard... it's just that ceph
volume does apply some structure to the naming of LVM VGs and LVs on
the OSD device and also adds metadata. That would then be up to the
user, right?
Regards
Christian
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