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Diffstat (limited to 'health/guides/mdstat/mdstat_mismatch_cnt.md')
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diff --git a/health/guides/mdstat/mdstat_mismatch_cnt.md b/health/guides/mdstat/mdstat_mismatch_cnt.md new file mode 100644 index 000000000..7a156e38f --- /dev/null +++ b/health/guides/mdstat/mdstat_mismatch_cnt.md @@ -0,0 +1,15 @@ +### Understand the alert + +This alert presents the number of unsynchronized blocks for the RAID array in crisis. Receiving this alert indicates a high number of unsynchronized blocks for the RAID array. This might indicate that data on the array is corrupted. + +This alert is raised to warning when the metric exceeds 1024 unsynchronized blocks. + +### Troubleshoot the alert + +There is no standard approach to troubleshooting this alert because the reasons can be various. + +For example, one of the reasons might be a swap on the array, which is relatively harmless. However, this alert can also be triggered by hardware issues which can lead to many problems and inconsistencies between the disks. + +### Useful resources + +[Serverfault | Reasons for high mismatch_cnt on a RAID1/10 array](https://serverfault.com/questions/885565/what-are-raid-1-10-mismatch-cnt-0-causes-except-for-swap-file/885574#885574) |