Wow. My expectations have been adjusted. Thank you for detailing your experience, so I had motivation to try again. Explicit steps I took: 1. went into "cephadm shell" and did a vgremove on the HDD 2. ceph-volume zap /dev/(hdd) 3. lvremove (the matching old lv). This meant that the VG on the SSD had 25% space available. At this point, "ceph-volume inventory" shows the HDD as "available=True", but the shared SSD as false. 4. on my actual admin node, "ceph orch apply osd -i osd.deployspec.yml" and after a few minutes... it DID actually pick up the disk and make the OSD. (I had prevously "ceph osd rm"'d the id. so it used the prior ID) SO... there's still the concern about why the thing mysteriosly crashed in the first place :-/ (on TWO osd's!) But at least I know how to rebuild a single disk. ----- Original Message ----- From: "Eugen Block" <eblock@nde.ag> To: "Stefan Kooman" <stefan@bit.nl> Cc: "ceph-users" <ceph-users@ceph.io>, "Philip Brown" <pbrown@medata.com> Sent: Friday, March 19, 2021 2:19:55 PM Subject: [BULK] Re: [ceph-users] Re: ceph octopus mysterious OSD crash I am quite sure that this case is covered by cephadm already. A few months ago I tested it after a major rework of ceph-volume. I don’t have any links right now. But I had a lab environment with multiple OSDs per node with rocksDB on SSD and after wiping both HDD and DB LV cephadm automatically redeployed the OSD according to my drive group file. Zitat von Stefan Kooman <stefan@bit.nl>:
On 3/19/21 7:47 PM, Philip Brown wrote:
I see.
I dont think it works when 7/8 devices are already configured, and the SSD is already mostly sliced.
OK. If it is a test cluster you might just blow it all away. By doing this you are simulating a "SSD" failure taking down all HDDs with it. It sure isn't pretty. I would say the situation you ended up with is not a corner case by any means. I am afraid I would really need to set up a test cluster with cephadm to help you further at this point, besides the suggestion above.
Gr. Stefan _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io