Re: ceph-volume lvm migrate error

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On 2023/08/02 13:29, Roland Giesler wrote:

On 2023/08/02 12:53, Igor Fedotov wrote:

First of all there are no block.db/block.wal symlinks in OSD folder. Which means there are no standalone DB/WAL any more.

That is surprising.  So ceph-volume is not able to extract the DB/WAL from an OSD to migrate it it seems?

I figured out the if one doesn't specify and separate LV for the DB/WAL, it is integrated into the data drive.

However, one can create a new DB/WAL for and OSD as follows:

# systemctl stop ceph-osd@14
# ceph-bluestore-tool bluefs-bdev-new-db --path /var/lib/ceph/osd/ceph-14 --dev-target /dev/NodeC-nvme1/NodeC-nvme-LV-RocksDB1 --bluestore-block-db-size 45G
inferring bluefs devices from bluestore path
DB device added /dev/dm-20
# systemctl start ceph-osd@14

And, viola!, it did it.

# ls -la /var/lib/ceph/osd/ceph-14/block*
lrwxrwxrwx 1 ceph ceph 50 Dec 25  2022 /var/lib/ceph/osd/ceph-14/block -> /dev/mapper/0GVWr9-dQ65-LHcx-y6fD-z7fI-10A9-gVWZkY lrwxrwxrwx 1 root root 10 Aug  2 21:17 /var/lib/ceph/osd/ceph-14/block.db -> /dev/dm-20

I'm just check it out now, so see if there are no errors and that it actually does what I think it does.
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