Is there a 'Howto' or 'workflow' to implement a one-line patch in a running cluster?  With full understanding it will be gone on the next upgrade? Hopefully without having to set up an entire packaging/development environment? Thanks! To implement: * /Subject/: Re: Permanent KeyError: 'TYPE' ->17.2.7: return self.blkid_api['TYPE'] == 'part' * /From/: Sascha Lucas <ceph-users@xxxxxxxxx> Problem found: in my case this is caused by DRBD secondary block devices, which can not be read until promoted to primary. ceph_volume/util/disk.py runs in blkid(): $ blkid -c /dev/null -p /dev/drbd4 blkid: error: /dev/drbd4: Wrong medium type but does not care about its return code. A quick fix is to use the get() method to automatically fall back to None for non existing keys: --- a/ceph_volume/util/device.py 2023-11-10 07:00:01.552497107 +0000 +++ b/ceph_volume/util/device.py 2023-11-10 08:54:40.320718690 +0000 @@ -476,13 +476,13 @@ @property def is_partition(self): self.load_blkid_api() if self.disk_api: return self.disk_api['TYPE'] == 'part' elif self.blkid_api: - return self.blkid_api['TYPE'] == 'part' + return self.blkid_api.get('TYPE') == 'part' return False Don't know why this is triggered in 17.2.7.