Scaling up broker storage
You can increase the amount of EBS storage per broker. You can't decrease the storage.
Storage volumes remain available during this scaling-up operation.
Important
When storage is scaled for an MSK cluster, the additional storage is
made available right away. However, the cluster requires a cool-down period after
every storage scaling event. Amazon MSK uses this cool-down period to optimize the
cluster before it can be scaled again. This period can range from a minimum of 6
hours to over 24 hours, depending on the cluster's storage size and utilization and
on traffic. This is applicable for both auto scaling events and manual scaling using
the UpdateBrokerStorage
You can use tiered storage to scale up to unlimited amounts of storage for your broker. See, Tiered storage.