Github user serg38 commented on the issue:
https://github.com/apache/cloudstack/pull/1257
@sureshanaparti I've been thinking if there is better way to re-sync all
portgroups and I couldn't come up with easy alternative. With that said if we
are copying portgroups for newly added host I propose to do the same for host
returning from Maintenance (CancelMaintenance). It is very possible that host
failed or was rebuild so it might not have all original portgroups and DRS will
be failing for it as well.
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