Installing third party software or upgrading OS components on an Avamar system is not supported.
If you need to do mccli scripting, I recommend setting up an external mccli host. Besides having control over the environment on that host, it would also keep a runaway script from invoking too many mccli calls at once which can exhaust the memory on the utility node or single node server, leading to issues on the Avamar.
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