# Un block shards un assigned
**URL:** https://discuss.elastic.co/t/un-block-shards-un-assigned/136702
**Category:** Elasticsearch
**Created:** [June 20, 2018, 1:35pm UTC](https://discuss.elastic.co/t/un-block-shards-un-assigned/136702 "2018-06-20T13:35:12Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@josselinchevalay](https://discuss.elastic.co/u/josselinchevalay)
#### Post date: [June 20, 2018, 1:35pm UTC](https://discuss.elastic.co/t/un-block-shards-un-assigned/136702/1 "2018-06-20T13:35:12Z")
Hello all,
topology our cluster :
we use elasticsearch 6.2.2 OSS version
we have 7 node :
- 1 master
- 6 data node
Currently we have lost a node when we restart that we have a indice cannot assign 2 shards on 4 shards when we see with \_cat/shards on reason we have that : UNASSIGNED DANGLING\_INDEX\_IMPORTED
when we reach on this shards we found also this tag no\_valid\_shard\_copy
after some google search we try that [https://medium.com/@remco\_verhoef/when-everything-else-fails-cc8a27c679d0](https://medium.com/@remco_verhoef/when-everything-else-fails-cc8a27c679d0) but not works rerouting also not works.
Somebody can explain me how to analyse that and resolve that please ?
Regards
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### Author:  [@tdasch](https://discuss.elastic.co/u/tdasch)
#### Post date: [June 20, 2018, 7:02pm UTC](https://discuss.elastic.co/t/un-block-shards-un-assigned/136702/2 "2018-06-20T19:02:20Z")
Chevalay,
Sorry to hear your node went down. Are all nodes back up at this point?
There is only one node in your cluster that is master eligible? Typically you want 3 master eligible nodes to help with resiliency and provide a necessary quorum to avoid split-brain.
I might take a look at the [cluster allocation explain API](https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-allocation-explain.html) which may help provide additional information. If you post your responses for those particular shards using the mentioned API it may be helpful.
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### Author:  [@josselinchevalay](https://discuss.elastic.co/u/josselinchevalay)
#### Post date: [June 21, 2018, 9:13am UTC](https://discuss.elastic.co/t/un-block-shards-un-assigned/136702/3 "2018-06-21T09:13:28Z")
Hi tdasch
in our config we precise that for data node
node.master: false
node.data : true
how to can 2 master node here to cause a split brain "split brains, the existence of two masters in a single cluster" : [https://www.elastic.co/guide/en/elasticsearch/guide/1.x/\_important\_configuration\_changes.html#\_minimum\_master\_nodes](https://www.elastic.co/guide/en/elasticsearch/guide/1.x/_important_configuration_changes.html#_minimum_master_nodes)
but good idea our cluster need more master to create quorum.
Regards
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 19, 2018, 9:13am UTC](https://discuss.elastic.co/t/un-block-shards-un-assigned/136702/4 "2018-07-19T09:13:29Z")
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