# Failed recovery - failed to fetch index version after copying it over error

**URL:** https://discuss.elastic.co/t/failed-recovery-failed-to-fetch-index-version-after-copying-it-over-error/64175
**Category:** Elasticsearch
**Created:** [October 27, 2016, 6:05pm UTC](https://discuss.elastic.co/t/failed-recovery-failed-to-fetch-index-version-after-copying-it-over-error/64175 "2016-10-27T18:05:08Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![stuayre](https://avatars.discourse-cdn.com/v4/letter/s/bc8723/32.png) [@stuayre](https://discuss.elastic.co/u/stuayre)
#### Post date: [October 27, 2016, 6:05pm UTC](https://discuss.elastic.co/t/failed-recovery-failed-to-fetch-index-version-after-copying-it-over-error/64175/1 "2016-10-27T18:05:08Z")

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HI,

I'm running two nodes, each node is on a different server.

I have a problem with 4 shards

here's the error:

{

```
"state": "UNASSIGNED",
"primary": true,
"node": null,
"relocating_node": null,
"shard": 1,
"index": "edata_gb",
"version": 555,
"unassigned_info": {
    "reason": "ALLOCATION_FAILED",
    "at": "2016-10-27T17:44:16.452Z",
    "details": "failed recovery, failure IndexShardRecoveryException[failed to fetch index version after copying it over]; nested: CorruptIndexException[i_o_exception: failed engine (reason: [merge failed]) (resource=preexisting_corruption)]; nested: NotSerializableExceptionWrapper[i_o_exception: failed engine (reason: [merge failed])]; nested: CorruptIndexException[checksum failed (hardware problem?) : expected=70acc986 actual=3699fd13 (resource=BufferedChecksumIndexInput(NIOFSIndexInput(path="/var/lib/elasticsearch/cluster01/nodes/0/indices/edata_gb/1/index/_10b3k.cfs") [slice=_10b3k.fdt]))]; "
}

```

}

i've no idea what this error means or how to fix it?

I've tried upgrading elastic search to version 2.4.1

---

<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: [July 5, 2017, 10:09pm UTC](https://discuss.elastic.co/t/failed-recovery-failed-to-fetch-index-version-after-copying-it-over-error/64175/2 "2017-07-05T22:09:02Z")

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