# Checksum failed (hardware problem?)
**URL:** https://discuss.elastic.co/t/checksum-failed-hardware-problem/322500
**Category:** Elasticsearch
**Created:** [January 5, 2023, 2:32am UTC](https://discuss.elastic.co/t/checksum-failed-hardware-problem/322500 "2023-01-05T02:32:36Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@yang\_peng](https://discuss.elastic.co/u/yang_peng)
#### Post date: [January 5, 2023, 2:32am UTC](https://discuss.elastic.co/t/checksum-failed-hardware-problem/322500/1 "2023-01-05T02:32:36Z")
A two-node cluster was restarted. The shard of one index failed to merge. The error is as follows：
```auto
failed shard on node [VosGChW1QTudYo9Tcl5sqg]: shard failure, reason [merge failed], failure NotSerializableExceptionWrapper[merge_exception: org.apache.lucene.index.CorruptIndexException: checksum failed (hardware problem?) : expected=5c0086c8 actual=1b883035 (resource=BufferedChecksumIndexInput(MMapIndexInput(path="/usr/share/elasticsearch/data/nodes/0/indices/mAcbjUzNTYO9SXqgGATv3w/3/index/_w2a_Lucene84_0.tim")))]; nested: CorruptIndexException[checksum failed (hardware problem?) : expected=5c0086c8 actual=1b883035 (resource=BufferedChecksumIndexInput(MMapIndexInput(path="/usr/share/elasticsearch/data/nodes/0/indices/mAcbjUzNTYO9SXqgGATv3w/3/index/_w2a_Lucene84_0.tim")))];
```
---
### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [January 5, 2023, 3:09am UTC](https://discuss.elastic.co/t/checksum-failed-hardware-problem/322500/2 "2023-01-05T03:09:50Z")
Welcome to our community! 😃
You should check your hardware then, as something is causing corruption when it is writing to disk.
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [January 11, 2023, 9:11pm UTC](https://discuss.elastic.co/t/checksum-failed-hardware-problem/322500/4 "2023-01-11T21:11:03Z")
Please don't post pictures of text, logs or code. They are difficult to read, impossible to search and replicate (if it's code), and some people may not be even able to see them 🙂
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 8, 2023, 9:11pm UTC](https://discuss.elastic.co/t/checksum-failed-hardware-problem/322500/5 "2023-02-08T21:11:17Z")
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