Comment 20 for bug 1830736

Hi Chen,

Journal header should be repaired when ceph is started, unless something changed with Mimic, the message you see should be treated as a warning ( 2019-05-30 17:58:23.946 7efc5f5751c0 -1 journal FileJournal::open: ondisk fsid 00000000-0000-0000-0000-000000000000 doesn't match expected f89591cf-a74f-4cff-85ed-8f93103267e0, invalid (someone else's?) journal ).
The journal partition is empty, cheps-osd sees this and initializes it as journal =» OSD should start correctly. Question is, why does it sometimes fail? It starts correctly most of the time...

So, if DB/manifest entries are ok, and the proposed fix works when moving journal from collocated to external on an existing OSD, please check one more more thing: when adding a new OSD with external journal (do not unlock, add a new OSD, collocate it to /dev/sdc1, then unlock) will you still see /dev/sdb1 and /dev/sdb2? It has to be there as user should be able to fallback to collocated in case the journal drive breaks (this was a product requirement at the time of implementation).