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[[recovery]]
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=== Index recovery
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Peer recovery syncs data from a primary shard to a new or existing shard copy.
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Peer recovery automatically occurs when {es}:
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* Recreates a shard lost during node failure
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* Relocates a shard to another node due to a cluster rebalance or changes to the
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<<modules-cluster, shard allocation settings>>
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You can view a list of in-progress and completed recoveries using the
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<<cat-recovery, cat recovery API>>.
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[float]
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==== Peer recovery settings
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`indices.recovery.max_bytes_per_sec`::
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(<<cluster-update-settings,Dynamic>>) Limits total inbound and outbound
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recovery traffic for each node. Defaults to `40mb`.
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+
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This limit applies to each node separately. If multiple nodes in a cluster
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perform recoveries at the same time, the cluster's total recovery traffic may
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exceed this limit.
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+
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If this limit is too high, ongoing recoveries may consume an excess of bandwidth
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and other resources, which can destabilize the cluster.
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+
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This is a dynamic setting, which means you can set it in each node's
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`elasticsearch.yml` config file and you can update it dynamically using the
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<<cluster-update-settings,cluster update settings API>>. If you set it
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dynamically then the same limit applies on every node in the cluster. If you do
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not set it dynamically then you can set a different limit on each node, which is
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useful if some of your nodes have better bandwidth than others. For example, if
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you are using <<overview-index-lifecycle-management,Index Lifecycle Management>>
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then you may be able to give your hot nodes a higher recovery bandwidth limit
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than your warm nodes.
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[float]
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==== Expert peer recovery settings
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You can use the following _expert_ setting to manage resources for peer
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recoveries.
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`indices.recovery.max_concurrent_file_chunks`::
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(<<cluster-update-settings,Dynamic>>, Expert) Number of file chunk requests
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sent in parallel for each recovery. Defaults to `2`.
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+
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You can increase the value of this setting when the recovery of a single shard
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is not reaching the traffic limit set by `indices.recovery.max_bytes_per_sec`.
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