Yes, because you did *not* specify a dedicated WAL device. This is also reflected in the OSD metadata: $ ceph osd metadata 6 | grep dedicated "bluefs_dedicated_db": "1", "bluefs_dedicated_wal": "0" Only if you had specified a dedicated WAL device you would see it in the lvm list output, so this is all as expected. You can check out the perf dump of an OSD to see that it actually writes to the WAL: # ceph daemon osd.6 perf dump bluefs | grep wal "wal_total_bytes": 0, "wal_used_bytes": 0, "files_written_wal": 1588, "bytes_written_wal": 1090677563392, "max_bytes_wal": 0, Zitat von Jan Marek <jmarek@jcu.cz>:
Hello,
but when I try to list devices config with ceph-volume, I can see a DB devices, but no WAL devices:
ceph-volume lvm list
====== osd.8 =======
[db] /dev/ceph-5aa92e38-077b-48e2-bda6-5b7db7b7701c/osd-db-bfd11468-d109-4f85-9723-75976f51bfb9
block device /dev/ceph-eaf5f0d7-ad50-4009-9ee6-04b8204b5b1a/osd-block-26b1d4b7-2425-4a2f-912b-111cf66a5970 block uuid j4s9lv-wS9n-xg2W-I4Y0-fUSu-Vuvl-9gOB2P cephx lockbox secret cluster fsid 2c565e24-7850-47dc-a751-a6357cbbaf2a cluster name ceph crush device class db device /dev/ceph-5aa92e38-077b-48e2-bda6-5b7db7b7701c/osd-db-bfd11468-d109-4f85-9723-75976f51bfb9 db uuid d9MZ2r-ImXX-Xod0-TNDS-tqi5-oG5Y-wrXFtW encrypted 0 osd fsid 26b1d4b7-2425-4a2f-912b-111cf66a5970 osd id 8 osdspec affinity osd_spec_default type db vdo 0 devices /dev/nvme0n1
[block] /dev/ceph-eaf5f0d7-ad50-4009-9ee6-04b8204b5b1a/osd-block-26b1d4b7-2425-4a2f-912b-111cf66a5970
block device /dev/ceph-eaf5f0d7-ad50-4009-9ee6-04b8204b5b1a/osd-block-26b1d4b7-2425-4a2f-912b-111cf66a5970 block uuid j4s9lv-wS9n-xg2W-I4Y0-fUSu-Vuvl-9gOB2P cephx lockbox secret cluster fsid 2c565e24-7850-47dc-a751-a6357cbbaf2a cluster name ceph crush device class db device /dev/ceph-5aa92e38-077b-48e2-bda6-5b7db7b7701c/osd-db-bfd11468-d109-4f85-9723-75976f51bfb9 db uuid d9MZ2r-ImXX-Xod0-TNDS-tqi5-oG5Y-wrXFtW encrypted 0 osd fsid 26b1d4b7-2425-4a2f-912b-111cf66a5970 osd id 8 osdspec affinity osd_spec_default type block vdo 0 devices /dev/sdi
(part of listing...)
Sincerely Jan Marek
Dne Po, čec 10, 2023 at 08:10:58 CEST napsal Eugen Block:
Hi,
if you don't specify a different device for WAL it will be automatically colocated on the same device as the DB. So you're good with this configuration.
Regards, Eugen
Zitat von Jan Marek <jmarek@jcu.cz>:
Hello,
I've tried to add to CEPH cluster OSD node with a 12 rotational disks and 1 NVMe. My YAML was this:
service_type: osd service_id: osd_spec_default service_name: osd.osd_spec_default placement: host_pattern: osd8 spec: block_db_size: 64G data_devices: rotational: 1 db_devices: paths: - /dev/nvme0n1 filter_logic: AND objectstore: bluestore
Now I have 12 OSD with DB on NVMe device, but without WAL. How I can add WAL to this OSD?
NVMe device still have 128GB free place.
Thanks a lot.
Sincerely Jan Marek -- Ing. Jan Marek University of South Bohemia Academic Computer Centre Phone: +420389032080 http://www.gnu.org/philosophy/no-word-attachments.cs.html
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-- Ing. Jan Marek University of South Bohemia Academic Computer Centre Phone: +420389032080 http://www.gnu.org/philosophy/no-word-attachments.cs.html