Small modifications to Bluestore migration documentation

[Alexander Kushnirenko <kushnirenko@xxxxxxxxx>]

Hello,

Luminous 12.2.2

There were several discussions on this list concerning Bluestore migration, as official documentation does not work quite well yet. In particular this one http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-January/024190.html

Is it possible to modify official documentation http://docs.ceph.com/docs/master/rados/operations/bluestore-migration/

Item 8
ceph osd destroy $ID --yes-i-really-mean-it
ADD COMMAND
ceph osd purge $ID  --yes-i-really-mean-it

Item 9

REPLACE (There is actually a typo - lvm is missing)

ceph-volume create --bluestore --data $DEVICE --osd-id $ID

WITH

ceph-volume lvm create --bluestore --data $DEVICE

ceph-volume will automatically pick previous osd-id 

PLUS a note to ignore errors ( _read_bdev_label unable to decode label at offset 102) https://tracker.ceph.com/issues/22285

Alexander.

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