Recently we have upgraded our servers from 6.2 to AEM 6.4.4 and we observed that many groups created till 6.2 was removed from the servers.
Is it caused by 6.4 upgrade?
Is it known issue?
Is there any fix for this to recover deleted groups?
Thanks in Advance.
We upgraded from 6.0 to 6.2, from 6.2 to 6.4 , and now 6.4 to 6.4.4
In every upgrade we found that some OOTB groups can get deprecated. or some new groups might show up.
A general practice which we follow for upgrade is...
1. Custom groups created by your team should be packaged and have merge or merge preserve mode.
2. Package your group and keep a backup.
3. Install this package post upgrade.
We have already upgraded to 6.4.4, but unfortunately we did not take any back-up of users/groups before upgrade.
I have few custom groups missing, so have created them again on server.
That seems only possible solution for me, thanks for looking into this.
I have checked all steps you have mentioned, except last 2.
This was an upgrade from 6.2 CFP-14 to AEM 6.4.4 directly and the groups which are missing are custom groups which we have created along the road. [Missing few not all]
Upgrade log was clean and successful.
I have read few more people complaining about the same issue.
 Migrate users, groups, and ACLs between AEM instances