Hi, when I was working on BZ#1624306 it turned out, that even if I'd fix the help-printing code in vdsm-client, there's still a lot of inconsistencies in API's schema files. After some investigation, I found that there's a code for reporting schema inconsistencies, but it's turned off because it bloats the logs. There's also a "strict" mode that raises an exception each time an inconsistency is found, but it's also off because there's so many of them. I think that no one wants to maintain both: the actual code and schema files. My idea would be to make the schema derived from the code at build time as a long-term effort. Before we can do that though, we need to address the inconsistencies first. https://gerrit.ovirt.org/#/q/status:open+project:vdsm+branch:master+topic:vd... This is a series of patches that helps fixing schema issues. What it does, is it adds a bunch of information from stack to vastly ease the process of fixing them. The logging level is also changed from 'WARNING' to 'DEBUG'. Here's an example of a logged entry: Host.setKsmTune With message: Required property pages_to_scan is not provided when calling Host.setKsmTune With backtrace: [ [ "_verify_object_type", { "call_arg_keys":[ "merge_across_nodes", "run" ], "schema_type_name":"KsmTuneParams" } ], [ "_verify_complex_type", { "schema_type_type":"object" } ] ] To make it work, a patch for OST's 'basic-master-suite' is on the way that switches 'schema.inconsistency' logger's logging level do 'DEBUG'. That way, we can find all reported errors in 'vdsm-schema-error.log' files. An initial report that groups reported errors by namespaces/methods has also been made. Please note, that an implementation that completely avoids error duplicates is really hard and IMHO not worth the effort. You can find the results here: * Host: https://pastebin.com/YM2XnvTV * Image: https://pastebin.com/GRc1yErL * LVMVolumeGroup: https://pastebin.com/R1276gTu * SDM: https://pastebin.com/P3tfYEDD * StorageDomain: https://pastebin.com/Q0DxKgF5 * StoragePool: https://pastebin.com/VXFWpfRC * VM: https://pastebin.com/tDC60c29 * Volume: https://pastebin.com/TYkr9Zsd * |jobs|: https://pastebin.com/jeXpYyz9 * |virt|: https://pastebin.com/nRREuEub Regards, Marcin