# Shard Allocation

**URL:** <https://discuss.elastic.co/t/shard-allocation/6268>\
**Category:** Elasticsearch\
**Created:** [January 3, 2012, 5:37am UTC](https://discuss.elastic.co/t/shard-allocation/6268 "2012-01-03T05:37:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![BARNEY](https://avatars.discourse-cdn.com/v4/letter/b/48db29/32.png) [@BARNEY](https://discuss.elastic.co/u/BARNEY)\
**Post date:** [January 3, 2012, 5:37am UTC](https://discuss.elastic.co/t/shard-allocation/6268/1 "2012-01-03T05:37:04Z")

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Hi,  
Assume I have created index with 3 shards and 1 replica on 3 nodes.i.e  
each node having 1 primary 1 replica shard with full of data.Now If I  
make down any one of the node,each one of Remaining nodes have 3  
shards(primary & replica).My doubt is....Previously we allocate only 2  
shards on a node with full of data but what is the meaning of  
allocating 3rd shard on the same node.Isnt the disk size full?

Thanks,  
Kalyan.

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**Author:** ![drewr](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/drewr/32/7803_2.png) [@drewr](https://discuss.elastic.co/u/drewr)\
**Post date:** [January 3, 2012, 8:30pm UTC](https://discuss.elastic.co/t/shard-allocation/6268/2 "2012-01-03T20:30:43Z")

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BARNEY wrote:

> Assume I have created index with 3 shards and 1 replica on 3  
> nodes.i.e each node having 1 primary 1 replica shard with full of  
> data.Now If I make down any one of the node,each one of Remaining  
> nodes have 3 shards(primary & replica).My doubt is....Previously we  
> allocate only 2 shards on a node with full of data but what is the  
> meaning of allocating 3rd shard on the same node.Isnt the disk size  
> full?

You would need to ensure each node's capacity is large enough to  
handle such a scenario.

-Drew

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**Author:** ![Karussell1](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@Karussell1](https://discuss.elastic.co/u/Karussell1)\
**Post date:** [January 3, 2012, 9:27pm UTC](https://discuss.elastic.co/t/shard-allocation/6268/3 "2012-01-03T21:27:52Z")

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> Isnt the disk size full?

Not sure if you understand the index/shard concept (read about it).  
A shard means: your index is splitted into several parts.  
Disc space isn't normally the problem when only one index is involved.

Peter.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 3:43am UTC](https://discuss.elastic.co/t/shard-allocation/6268/4 "2017-07-06T03:43:55Z")

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