Thanks - wipefs fails see below # dmsetup ls luks-ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 (253:9) luks-35719a97-5898-4420-9a56-1576ffdc6db3 (253:1) luks-c80d9988-30f6-42cf-a9b7-89ee3408eccb (253:6) luks-03c06df8-f9b9-4f0d-847e-79a7ed527888 (253:0) luks-a2ebb2b0-527d-47f3-83ef-e5908805f31d (253:3) luks-5ee2ed8e-4bdf-43e1-adb0-34a70610a77f (253:2) luks-d348150c-3a5d-456e-bedd-1cfaa51839f9 (253:7) luks-24ef3c76-0b18-45e3-a532-5983f77be5e3 (253:4) luks-02fdb3bb-bd65-4d50-a586-63bc13e0dc30 (253:5) luks-2871ae45-e563-4ae4-991d-d71693c749bf (253:8) # cryptsetup status luks-ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 /dev/mapper/luks-ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 is active. type: LUKS1 cipher: aes-xts-plain64 keysize: 512 bits device: /dev/md127 offset: 4096 sectors size: 7813767168 sectors mode: read/write
# wipefs --backup -a /dev/md127 wipefs: error: /dev/md127: probing initialization failed: Device or resource busy # mdadm -S /dev/md127 mdadm: Cannot get exclusive access to /dev/md127:Perhaps a running process, mounted filesystem or active volume group? On 02/01/2015 08:19 PM, Chris Murphy wrote: What do you get for: dmsetup ls cryptsetup status I see this: /dev/mapper/luks-ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 /raid1 This suggests an encrypted device mapper device created from the raid1 device, and it's active. So that has to be closed, or wipefs before you can stop the raid and then wipe the raid, i.e. you need to tear it down in the reverse order it was created. You can try this: DOUBLE CHECK DEVICE VALUES wipefs --backup -a /dev/md127 mdadm -S /dev/md127 wipefs --backup -a /dev/sd[cd]1 That will backup the luks signature, then wipe it, stop the array, then backup and wipe the mdadm superblock signature. That ought to fix the problem unless there's also LVM stuff going on here too. The --backup isn't strictly necessary but will write out a file and instructions on how to restore what it wipes in case you get the command wrong and wipe the wrong device. -- Quis custodiet ipsos custodes
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