Posted 8/1/2022 on the IBM Support Page

IBM MQ multi-instance and RDMQ require same userid for user ‘mqm’ and same groupid for group ‘mqm’ across nodes.

Read this article to learn discrepancies with the file ownership when files are created/updated in multiple servers by the same username, but because that username is associated with a different user id in each server, then the OS show inconsistent behavior: the user will be owner of a shared file from one host, but not the owner from another host.

For MQ Administration in an enterprise, one of the best practices is to use the same userid (uid) for the username “mqm” and the same groupid (gid) for the groupname “mqm”, in all the hosts / servers / VMs where MQ queue managers will be located

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