18 lines
918 B
Plaintext
18 lines
918 B
Plaintext
[role="xpack"]
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[[autoscaling-reactive-storage-decider]]
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=== Reactive storage decider
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The reactive storage decider (`reactive_storage`) calculates the storage required to contain
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the current data set. It signals that additional storage capacity is necessary
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when existing capacity has been exceeded (reactively).
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The reactive storage decider is enabled for all policies governing data nodes and has no configuration options.
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The decider relies partially on using <<data-tier-allocation,data tier preference>>
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allocation rather than node attributes. In particular, scaling a data tier into
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existence (starting the first node in a tier) will result in starting a node in
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any data tier that is empty if not using allocation based on data tier preference.
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Using the <<ilm-migrate,ILM migrate>> action to migrate between tiers is the
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preferred way of allocating to tiers and fully supports scaling a tier into
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existence.
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