# Heap | Buff/Cache considerations on WARM nodes

**URL:** <https://discuss.elastic.co/t/heap-buff-cache-considerations-on-warm-nodes/166705>\
**Category:** Elasticsearch\
**Created:** [February 1, 2019, 9:57am UTC](https://discuss.elastic.co/t/heap-buff-cache-considerations-on-warm-nodes/166705 "2019-02-01T09:57:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Zerobot](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/zerobot/32/48977_2.png) [@Zerobot](https://discuss.elastic.co/u/Zerobot)\
**Post date:** [February 1, 2019, 9:57am UTC](https://discuss.elastic.co/t/heap-buff-cache-considerations-on-warm-nodes/166705/1 "2019-02-01T09:57:39Z")

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Hi!

I've got a Hot/Warm infrastructure. 4 Hot and 4 Warm nodes, 16GB RAM each. I've set a 7GB of HEAP on each node but I've got a question regarding HEAP on WARM nodes:

If WARM nodes are used only for storing older data, would it be a good idea to actually decrease heap size and leave more memory for Buff/Cache? It seems those Warm nodes aren't using Heap too much, like 20% is their maximum use but they do use Buff/Cache RAM a lot.

Edit: Also those Warm nodes are not used directly for Queries, Hot nodes are.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 1, 2019, 9:57am UTC](https://discuss.elastic.co/t/heap-buff-cache-considerations-on-warm-nodes/166705/2 "2019-03-01T09:57:43Z")

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