MSA don't support deduplication feature
Coming to your issue which is related to scheduler failure, I would like to know both MSA running with what version of Controller firmware ?
If not in latest then you should consider upgrading Controller firmware to latest version VE270R001-01 which is having many fix related to replication. Please refer the released notes from below link,
There could be space issue as well. We need to check how much is the Virtual Pool size and how many volumes part of it. How much space consumed by each volume. Related to replication two internal snapshots will be there and that also consumes space and it depends upon how "over commit" setting configured.
Hope this helps!
Regards
Subhajit
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