Bug #46558: cephadm: paths attribute ignored for db_devices/wal_devices via OSD spec - Orchestrator - Ceph

Actions

Copy link

Bug #46558

closed

cephadm: paths attribute ignored for db_devices/wal_devices via OSD spec

Added by Dimitri Savineau over 5 years ago. Updated 8 months ago.

Status:

Resolved

Priority:

High

Assignee:

Juan Miguel Olmo Martínez

Category:

cephadm/osd

Target version:

Ceph - v17.0.0

% Done:

Source:

Community (dev)

Backport:

Regression:

Severity:

2 - major

Reviewed:

Affected Versions:

Ceph - v16.0.0

ceph-qa-suite:

Pull request ID:

39415

Tags (freeform):

Merge Commit:

156a4ee786edd000dc2d978a2f98041666f2aac4

Fixed In:

v17.0.0-1098-g156a4ee786

Released In:

v17.2.0~2926

Upkeep Timestamp:

2025-07-14T19:36:45+00:00

Description

When creating an OSD spec for using dedicated devices for either DB and/or WAL bluestore devices, we can't use the paths drive group attribute [1] because it seems currently ignored but works for data_devices.

# cat osds.yml
service_type: osd
service_id: foo
placement:
  label: osds
data_devices:
  paths:
    - /dev/sdc
db_devices:
  paths:
    - /dev/sdd
encrypted: false
# cephadm shell -m osds.yml -- ceph orch apply osd -i /mnt/osds.yml
INFO:cephadm:Inferring fsid b6dc7042-c6ac-11ea-974b-fa163e8d447e
INFO:cephadm:Inferring config /var/lib/ceph/b6dc7042-c6ac-11ea-974b-fa163e8d447e/mon.ofgnapinv-1/config
INFO:cephadm:Using recent ceph image docker.io/ceph/daemon-base:latest-master
WARNING: The same type, major and minor should not be used for multiple devices.
Scheduled osd.foo update...

As a result, there's an OSD created on /dev/sdc only without the bluestore DB on /dev/sdd

# cephadm shell -- ceph-volume lvm list
INFO:cephadm:Inferring fsid b6dc7042-c6ac-11ea-974b-fa163e8d447e
INFO:cephadm:Inferring config /var/lib/ceph/b6dc7042-c6ac-11ea-974b-fa163e8d447e/mon.ofgnapinv-1/config
INFO:cephadm:Using recent ceph image docker.io/ceph/daemon-base:latest-master
WARNING: The same type, major and minor should not be used for multiple devices.
WARNING: The same type, major and minor should not be used for multiple devices.
WARNING: The same type, major and minor should not be used for multiple devices.

====== osd.5 =======

  [block]       /dev/ceph-bd41b3ba-23a0-4e03-bb1c-5e17f89136a1/osd-block-fde2284b-1f59-48ab-995f-706a3e49c6bf

      block device              /dev/ceph-bd41b3ba-23a0-4e03-bb1c-5e17f89136a1/osd-block-fde2284b-1f59-48ab-995f-706a3e49c6bf
      block uuid                avv5vs-2gZg-how1-kYnq-PAGL-bsfL-qAHg8m
      cephx lockbox secret      
      cluster fsid              b6dc7042-c6ac-11ea-974b-fa163e8d447e
      cluster name              ceph
      crush device class        None
      encrypted                 0
      osd fsid                  fde2284b-1f59-48ab-995f-706a3e49c6bf
      osd id                    5
      osdspec affinity          foo
      type                      block
      vdo                       0
      devices                   /dev/sdc

[1] https://github.com/ceph/ceph/blob/master/src/python-common/ceph/deployment/drive_group.py#L27

Related issues 3 (0 open — 3 closed)

Actions

Copy link

Updated by Sebastian Wagner over 5 years ago

Category changed from cephadm to cephadm/osd

Actions

Copy link

Updated by Saputro Aryulianto over 5 years ago

Dimitri Savineau wrote:

When creating an OSD spec for using dedicated devices for either DB and/or WAL bluestore devices, we can't use the paths drive group attribute [1] because it seems currently ignored but works for data_devices.

[...]

As a result, there's an OSD created on /dev/sdc only without the bluestore DB on /dev/sdd

[...]

[1] https://github.com/ceph/ceph/blob/master/src/python-common/ceph/deployment/drive_group.py#L27

Hi,

there is any update for this issue? since create wal devices by paths attribute is very common and important

Actions

Copy link

Updated by Dimitri Savineau over 5 years ago

It looks like it has been decided to ignore this at the moment

https://github.com/ceph/ceph/pull/36543

Actions

Copy link

Updated by Sebastian Wagner over 5 years ago

Status changed from New to Resolved
Target version changed from v16.0.0 to v15.2.5
Pull request ID set to 36543

Actions

Copy link

Updated by Dimitri Savineau over 5 years ago

@Sebastien : does that mean we need another tracker for implementing this feature or it won't happen at all ?

I thought PR 36543 was only a temporary solution until something was implemented.

Actions

Copy link

Updated by Joshua Schmid over 5 years ago

DriveGroups are supposed to `describe` a state/layout without explicitly pointing to disk identifiers.

If there is a specific example where the existing filters are not sufficient to depict the desired cluster layout we can certainly talk about extending the functionality of the drivegroups.

`paths` for data_devices are mainly for testing purposes and should not be used in production clusters unless absolutely unavoidable(for whatever reason).

Actions

Copy link