Zone-aware data migration #483
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Reference: Deuxfleurs/garage#483
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I recently set up a
garage
cluster with a single node in two zones, and of course - a replication count of2
. These two nodes have a small datapipe between themselves.I then added a single node to one of the zones (below as
ccc
), and garage presented this new layout:As an admin, I thought - "OK, it knows that the data is in
aaa
and will move that toccc
in the same zone - they have a full gigabit link and that should take no time".However - looking at the Prometheus metrics, garage instead decided to take half the data from
aaa
and then the other half frombbb
- which took longer due to the smaller pipe.I think garage should prioritize moving the data from within the zone itself if that it available.