[ovirt-users] Multiple hosts stuck in Connecting state waiting for storage pool to go up.

Hi! We have a problem with multiple hosts stuck in Connecting state, which I hoped somebody here could help us wrap our heads around. All hosts, except one, seem to have very similar symptoms but I'll focus on one host that represents the rest. So, the host is stuck in Connecting state and this what we see in oVirt log files. /var/log/ovirt-engine/engine.log: 2023-04-20 09:51:53,021+03 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.GetCapabilitiesAsyncVDSCommand] (EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-37) [] Command 'GetCapabilitiesAsyncVDSCommand(HostName = ABC010-176-XYZ, VdsIdAndVdsVDSCommandParametersBase:{hostId='2c458562-3d4d-4408-afc9-9a9484984a91', vds='Host[ABC010-176-XYZ,2c458562-3d4d-4408-afc9-9a9484984a91]'})' execution failed: org.ovirt.vdsm.jsonrpc.client.ClientConnectionException: SSL session is invalid 2023-04-20 09:55:16,556+03 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-67) [] EVENT_ID: VDS_BROKER_COMMAND_FAILURE(10,802), VDSM ABC010-176-XYZ command Get Host Capabilities failed: Message timeout which can be caused by communication issues /var/log/vdsm/vdsm.log: 2023-04-20 17:48:51,977+0300 INFO (vmrecovery) [vdsm.api] START getConnectedStoragePoolsList() from=internal, task_id=ebce7c8c-6ded-454e-9aee-86edf72764ef (api:31) 2023-04-20 17:48:51,977+0300 INFO (vmrecovery) [vdsm.api] FINISH getConnectedStoragePoolsList return={'poollist': []} from=internal, task_id=ebce7c8c-6ded-454e-9aee-86edf72764ef (api:37) 2023-04-20 17:48:51,978+0300 INFO (vmrecovery) [vds] recovery: waiting for storage pool to go up (clientIF:723) Both engine.log and vdsm.log are flooded with these messages. They are repeated at regular intervals ad infinitum. This is one common symptom shared by multiple hosts in our deployment. They all have these message loops in engine.log and vdsm.log files. On all Running vdsm-client Host getConnectedStoragePools also returns an empty list represented by [] on all hosts (but interestingly there is one that showed Storage Pool UUID and yet it was still stuck in Connecting state). This particular host (ABC010-176-XYZ) is connected to 3 CEPH iSCSI Storage Domains and lsblk shows 3 block devices with matching UUIDs in their device components. So, the storage seems to be connected but the Storage Pool is not? How is that even possible? Now, what's even more weird is that we tried rebooting the host (via Administrator Portal) and it didn't help. We even tried removing and re-adding the host in Administrator Portal but to no avail. Additionally, the host refused to go into Maintenance mode so we had to enforce it by manually updating Engine DB. We also tried reinstalling the host via Administrator Portal and ran into another weird problem, which I'm not sure if it's a related one or a problem that deserves a dedicated discussion thread but, basically, the underlying Ansible playbook exited with the following error message: "stdout" : "fatal: [10.10.10.176]: UNREACHABLE! => {\"changed\": false, \"msg\": \"Data could not be sent to remote host \\\"10.10.10.176\\\". Make sure this host can be reached over ssh: \", \"unreachable\": true}", Counterintuitively, just before running Reinstall via Administrator Portal we had been able to reboot the same host (which as you know oVirt does via Ansible as well). So, no changes on the host in between just different Ansible playbooks. To confirm that we actually had access to the host over ssh we successfully ran ssh -p $PORT root(a)10.10.10.176 -i /etc/pki/ovirt-engine/keys/engine_id_rsa and it worked. That made us scratch our heads for a while but what seems to had fixed Ansible's ssh access problems was manual full stop of all VDSM-related systemd services on the host. It was just a wild guess but as soon as we stopped all VDSM services Ansible stopped complaining about not being able to reach the target host and successfully did its job. I'm sure you'd like to see more logs but I'm not certain what exactly is relevant. There are a ton of logs as this deployment is comprised of nearly 80 hosts. So, I guess it's best if you just request to see specific logs, messages or configuration details and I'll cherry-pick what's relevant. We don't really understand what's going on and would appreciate any help. We tried just about anything we could think of to resolve this issue and are running out of ideas what to do next. If you have any questions just ask and I'll do my best to answer them.