### Author:  [@tarund](https://discuss.elastic.co/u/tarund)
#### Post date: [January 6, 2022, 5:39am UTC](https://discuss.elastic.co/t/elasticsearch-disk-based-shard-allocation-tuning/293616/1 "2022-01-06T05:39:39Z")
I am running 2 node Elasticsearch cluster v7.9.2
Ingesting data through APM-Server v7.15.0, creates ~50 new indices daily with pattern
apm-7.15.0-\-transaction-YYYY.MM.DD
Observing that all new primary shards of new indices are getting created on 1 node, even though the free disk space % is lesser than the other node.
How do I make the allocation of shards equally on both nodes ?
How can I assign the allocation for a certain index pattern on a particular node.
Below is the cluster setting
```auto
"persistent" : {
"cluster" : {
"routing" : {
"rebalance" : {
"enable" : "primaries"
},
"allocation" : {
"node_concurrent_incoming_recoveries" : "5",
"node_concurrent_recoveries" : "5",
"disk" : {
"watermark" : {
"low" : "75%",
"flood_stage" : "90%",
"high" : "80%"
}
},
"enable" : "primaries"
}
},
"max_shards_per_node" : "3000"
},
"xpack" : {
"monitoring" : {
"collection" : {
"enabled" : "true"
}
}
}
```
---
### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [January 9, 2022, 10:11pm UTC](https://discuss.elastic.co/t/elasticsearch-disk-based-shard-allocation-tuning/293616/2 "2022-01-09T22:11:31Z")
Allocation is based on shard count, then total disk use as a percentage.
So what does `_cat/allocation?v` show?
> [@tarund](#):
>
> Elasticsearch cluster v7.9.2
You should really be running a newer version of Elasticsearch with APM at 7.15, ideally, the same versions.
> [@tarund](#):
>
> `"max_shards_per_node" : "3000"`
That's likely to cause you issues.
---
### Author:  [@tarund](https://discuss.elastic.co/u/tarund)
#### Post date: [January 12, 2022, 11:39am UTC](https://discuss.elastic.co/t/elasticsearch-disk-based-shard-allocation-tuning/293616/3 "2022-01-12T11:39:17Z")
Hi @warkolm , output for \_cat/allocation?v is as below
```auto
shards disk.indices disk.used disk.avail disk.total disk.percent host ip node
208 1.4tb 1.6tb 1tb 2.6tb 59 2.12.27.1 2.12.27.1 node1
185 515gb 772.8gb 602.1gb 1.3tb 56 2.12.25.2 2.12.25.2 node2
```
if allocation is based on shard count, then in above case, if 50 new indices are created ;would all new shards get allocated to just one node ?
I have also tried the below settings in index template, and changed the weight setting in cluster - "cluster.routing.allocation.balance.index": "20.0"(tried value as 1,10,20)
```auto
"number_of_routing_shards": "4",
"number_of_shards": "2",
"number_of_replicas": "0"
```
but still both shards of same index are allocated on same node. Can you help me resolve this so that I have 2 shards per index on separate nodes.
---
### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [January 12, 2022, 7:00pm UTC](https://discuss.elastic.co/t/elasticsearch-disk-based-shard-allocation-tuning/293616/4 "2022-01-12T19:00:43Z")
> [@tarund](#):
>
> Can you help me resolve this so that I have 2 shards per index on separate nodes.
You probably want to look at using this, rather than altering cluster settings - [Cluster-level shard allocation and routing settings | Elasticsearch Guide [7.16] | Elastic](https://www.elastic.co/guide/en/elasticsearch/reference/7.16/modules-cluster.html#shard-allocation-awareness)
---
### Author:  [@tarund](https://discuss.elastic.co/u/tarund)
#### Post date: [January 21, 2022, 5:38am UTC](https://discuss.elastic.co/t/elasticsearch-disk-based-shard-allocation-tuning/293616/5 "2022-01-21T05:38:50Z")
Thanks @warkolm . awareness attribute worked for me.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 18, 2022, 5:38am UTC](https://discuss.elastic.co/t/elasticsearch-disk-based-shard-allocation-tuning/293616/6 "2022-02-18T05:38:55Z")
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