WingsGo edited a comment on issue #2980: [Conf]Make default_storage_medium configurable URL: https://github.com/apache/incubator-doris/pull/2980#issuecomment-590913254 > I don't quite understand how this configuration solves the problem you mentioned in the #2954 ? For example, the current clusters are HDD, and now some machines need to be replaced with SSDs. How to use this configuration in this case? Yes, this configuration can not change partitions already is HDD. But if cluster medium is changed from HDD to SSD, admin should change the history partitions storage medium. But for users, they may have no idea that the cluster storage_medium is changed or even they don't konw about they can specify the storage_medium.So in this case, they will create table as usual, this will cause all partitions's storage_medium after migration is default (HDD), but currently, the cluster have no machine who's medium is HDD, this will cause some problem about cluster balance.
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