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On one of the server, The RAID10 software raid volume had became RAID0 after one the disks in the RAID10 disk group failed. Also the converted RAID0 volume has become inactive.

How can we recover the RAID volume after replacing the failed disk.

Thank you very much for your support.

Screenshots:

mdadm --details of the Volume

mdadm --examine of slice1

mdadm --examine of slice2

mdadm --examine of slice3

mdadm --examine of slice4

Michael Hampton
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Chandra
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    Welcome to Server Fault! We'll need more information before we can help you. Please post the output of `mdadm --detail` for the array, and the output of `mdadm --examine` for each drive in the array. – Mike Andrews Aug 31 '21 at 15:10
  • Thank you @mike Andrews fort your response, Actually I have MD volume with 4 slices, one of them was failed due to underlying disk faults. The RAID10 volume went into Inactive state and became RAID1. After replacing the failed disk created partitions back. Recreated the RAID10 volume with the same partition, then the RAID10 volume back online but i am unable to mount it. – Chandra Sep 02 '21 at 11:11
  • Please see attached images. – Chandra Sep 02 '21 at 11:24
  • What happens when you try to mount it? What are the error? Also post `dmesg` logs after trying to mount it & also `blkid /dev/md127` would be nice. – NStorm Sep 02 '21 at 11:54
  • Output of these commands is naturally text, not image, so much better is to attach them as text code-blocks into the question. – Nikita Kipriyanov Sep 02 '21 at 13:39
  • What do you mean by "paritions"? You have a partitionable array? Which one is replaced disk? – Nikita Kipriyanov Sep 02 '21 at 13:43

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