qa/cephadm: zap raw devices before OSD deployment

ceph_osds() assumes all teuthology scratch devices are clean
and directly usable by:

 > ceph orch apply osd --all-available-devices --method raw

However, in practice some devices may retain stale BlueStore metadata
(or other data) from previous runs. cephadm correctly skips such
devices, leading to fewer OSDs than expected and causing the test to
timeout waiting for an exact OSD count.

This change adds a pre-deployment cleanup step for `raw-osds` that:
- zaps any existing BlueStore metadata (`ceph-bluestore-tool zap-device`)
- removes filesystem signatures (`wipefs --all`)
- clears initial disk data (`dd`)

This ensures all scratch devices are truly available for OSD
deployment and prevents mismatches between expected and actual OSD
counts.

Fixes: https://tracker.ceph.com/issues/75218
Signed-off-by: Redouane Kachach <rkachach@ibm.com>

diff --git a/qa/tasks/cephadm.py b/qa/tasks/cephadm.py
index d4e1b78ab455ae3cb2133e57a45f18d92723e22c..2ce26389a22ae2c5c67c6e03a977383545bb2053 100644 (file)
--- a/qa/tasks/cephadm.py
+++ b/qa/tasks/cephadm.py
@@ -1139,6 +1139,23 @@ def ceph_osds(ctx, config):
             cur += 1
 
         if cur == 0:
+            if raw:
+                for remote, devs in devs_by_remote.items():
+                    for dev in devs:
+                        log.info(f'Zapping device {dev} on {remote.shortname} before raw OSD deployment')
+                        remote.run(
+                            args=[
+                                'sudo', 'ceph-bluestore-tool', 'zap-device',
+                                '--dev', dev,
+                                '--yes-i-really-really-mean-it',
+                            ],
+                            check_status=False,
+                        )
+                        remote.run(args=['sudo', 'wipefs', '--all', dev], check_status=False)
+                        remote.run(
+                            args=['sudo', 'dd', 'if=/dev/zero', f'of={dev}', 'bs=1M', 'count=10', 'conv=fsync'],
+                            check_status=False,
+                        )
             osd_cmd = ['ceph', 'orch', 'apply', 'osd', '--all-available-devices']
             if raw:
                 osd_cmd.extend(['--method', 'raw'])