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I’m planing to upgrade our Commserve from 11.28 to 11.36. During earlier updates I started the update with Commserve and Commcell Consol. If it succeeded, Media Agents followed one by one. Maybe our 8 MA was updated in two different day. Thereafter, clients followed.

But now, in the “Changes in Commvault Platform Release 2024E (11.36)” document I can find that, “You must upgrade all MediaAgents at the same time.” Why is it mandatory?
Commserve 11.36 can’t manage MA ‘s on version 11.28? Two MA, one on 11.28, other on 11.36 can’t work together? Not forever, just for a few days.
Thanks in advance.

Feature enhancements generally roll out via the CommServe and/or Media Agents. You do not want to be a situation where they are running mismatched versions and do not have alignment on the features they support.  Keeping them on the same version eliminates that risk.

If you MUST run mismatched versions for a very short term, I recommend making sure they are not Media Agents managing the same storage and/or agent types.  This does not eliminate all risk, but it should help minimize the risk.

Thanks,
Scott
 

I have found specific cases that require updating Media Agents to 11.36. after CommServe upgrade.
Disaster Recovery Backup Disk Phase suceeded after CommServe upgrade, but copy to Disaster Recovery Storage Policy failed with MA on 11.28. After MA upgrade everything succeeded.
Auxiliary Copies can't run between different MA versions. When MAs on the same 11.36 version, all copies are succeeded.
So, I think, MA upgrade to 11.36 highly recommended immediately after upgrading CommServe to 11.36.

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