# Elastic Agent fails to read io.stat file with more than one $MAJ:$MIN device number

**URL:** <https://discuss.elastic.co/t/elastic-agent-fails-to-read-io-stat-file-with-more-than-one-maj-min-device-number/330026>\
**Category:** Beats\
**Tags:** metricbeat\
**Created:** [April 14, 2023, 2:46pm UTC](https://discuss.elastic.co/t/elastic-agent-fails-to-read-io-stat-file-with-more-than-one-maj-min-device-number/330026 "2023-04-14T14:46:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vitalyrychkov](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vitalyrychkov/32/119408_2.png) [@vitalyrychkov](https://discuss.elastic.co/u/vitalyrychkov)\
**Post date:** [April 14, 2023, 2:46pm UTC](https://discuss.elastic.co/t/elastic-agent-fails-to-read-io-stat-file-with-more-than-one-maj-min-device-number/330026/1 "2023-04-14T14:46:37Z")

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We have a cluster with multiple VM nodes and a physical node, let's say "PH". The physical node has attached network storage with the multi-path option enabled. When elastic-agent (8.7.0) daemonset is deployed in this cluster, the agent running on the "PH" node starts to print out error messages:

`{"log.level":"error","@timestamp":"2023-04-12T08:48:08.152Z","message":"error getting cgroup stats for V2: error fetching stats for controller io: error fetching IO stats: error getting io.stats for path /hostfs/sys/fs/cgroup: error scanning file: /hostfs/sys/fs/cgroup/io.stat: input does not match format","component":{"binary":"metricbeat","dataset":"elastic_agent.metricbeat","id":"kubernetes/metrics-default","type":"kubernetes/metrics"},"log":{"source":"kubernetes/metrics-default"},"log.logger":"metrics","log.origin":{"file.line":234,"file.name":"report/report.go"},"service.name":"metricbeat","ecs.version":"1.6.0","ecs.version":"1.6.0"}`

On the VM-nodes elastic-agent can read io.stat

```auto
# cat /hostfs/sys/fs/cgroup/io.stat
7:8 rbytes=14336 wbytes=0 rios=11 wios=0 dbytes=0 dios=0
253:0 rbytes=966835712 wbytes=15229238784 rios=22127 wios=1035229 dbytes=0 dios=0
8:0 rbytes=1060506112 wbytes=15229890048 rios=23426 wios=900790 dbytes=0 dios=0
11:0 rbytes=2048 wbytes=0 rios=10 wios=0 dbytes=0 dios=0
7:7 rbytes=89740288 wbytes=0 rios=2610 wios=0 dbytes=0 dios=0
7:6 rbytes=484352 wbytes=0 rios=42 wios=0 dbytes=0 dios=0
7:5 rbytes=1259520 wbytes=0 rios=68 wios=0 dbytes=0 dios=0
7:4 rbytes=1224704 wbytes=0 rios=54 wios=0 dbytes=0 dios=0
7:3 rbytes=2428928 wbytes=0 rios=244 wios=0 dbytes=0 dios=0
7:2 rbytes=485376 wbytes=0 rios=44 wios=0 dbytes=0 dios=0
7:1 rbytes=483328 wbytes=0 rios=42 wios=0 dbytes=0 dios=0
7:0 rbytes=499712 wbytes=0 rios=49 wios=0 dbytes=0 dios=0

```

On the "PH" node elastic-agent fails to read io.stat, I assume it is due to two MAJ:MIN numbers in the line #4:

```auto
# cat /hostfs/sys/fs/cgroup/io.stat
7:8 rbytes=14336 wbytes=0 rios=11 wios=0 dbytes=0 dios=0
253:0 rbytes=1634749952 wbytes=5449465344 rios=38749 wios=399082 dbytes=0 dios=0
9:126 rbytes=16306176 wbytes=0 rios=724 wios=0 dbytes=0 dios=0
9:127 8:16 rbytes=18655744 wbytes=0 rios=967 wios=0 dbytes=0 dios=0
8:0 rbytes=1650753024 wbytes=5449609728 rios=39161 wios=373122 dbytes=0 dios=0
11:0 rbytes=0 wbytes=0 rios=3 wios=0 dbytes=0 dios=0
7:7 rbytes=92527616 wbytes=0 rios=2418 wios=0 dbytes=0 dios=0
7:6 rbytes=484352 wbytes=0 rios=42 wios=0 dbytes=0 dios=0
7:5 rbytes=1259520 wbytes=0 rios=68 wios=0 dbytes=0 dios=0
7:4 rbytes=1225728 wbytes=0 rios=54 wios=0 dbytes=0 dios=0
7:3 rbytes=2302976 wbytes=0 rios=238 wios=0 dbytes=0 dios=0
7:2 rbytes=483328 wbytes=0 rios=42 wios=0 dbytes=0 dios=0
7:1 rbytes=485376 wbytes=0 rios=44 wios=0 dbytes=0 dios=0
7:0 rbytes=499712 wbytes=0 rios=49 wios=0 dbytes=0 dios=0

```

I assume the issue is caused by using multi-path option for the attached storage. If my assumption is correct, could you please enhance metricbeat to accept multiple MAJ:MIN device numbers in the io.stat?

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<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:** [May 31, 2023, 5:00pm UTC](https://discuss.elastic.co/t/elastic-agent-fails-to-read-io-stat-file-with-more-than-one-maj-min-device-number/330026/3 "2023-05-31T17:00:04Z")

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