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startSystem asks for a password:
mcsadmin> startSystem
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startsystem Wed Jan 10 17:36:06 2018
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startSystem command, 'columnstore' service is down, sending command to
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start the 'columnstore' service on all modules
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System being started, please wait...FAILED: Invalid password
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Invalid Password when running 'columnstore start' on module pm1, can retry by providing password as the second argument
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**** startSystem Failed
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The documentation does not mention any password for this command.
https://mariadb.com/kb/en/library/mariadb-columnstore-system-usage/#starting-the-system-or-modules
https://mariadb.com/kb/en/library/columnstore-administrative-console/
The help text says it's the "server root password". If this is correct, then that information should probably be documented.
mcsadmin> help startSystem
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help Thu Jan 11 18:57:41 2018
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Command: startSystem
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Description: Starts a stopped or shutdown MariaDB Columnstore System
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If system is shutdown, then a server root password should be entered if a ssh key is not defined
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Arguments: Optional: Server-root-password
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However, I'm skeptical that this help text is completely accurate. Since non-root installs are supported, I would imagine that there are cases where this password is not the server root password, and it is actually the password for some other user account. If this is correct, then both the documentation and the help text should probably be updated.
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In the non root case it would be the unix password of the non root user account. I believe that this is also only needed in the case where the system was shutdown completely. If the columnstore systemd services are all running its not needed.