On Mon, Jun 22, 2026 at 07:50:10AM +0200, Michel Verdier wrote: > On 2026-06-21, Paul Leiber wrote: > > > I managed to rebuild the md RAID1 using the data on the seemingly failed > > device (partition_1). First, I did a dd dump of partition_2 (currently in > > usage) in order not to lose data. Then, I recreated the RAID1 using the data > > from partition_1: > > > > mdadm --stop /dev/md0 # This stops the degraded RAID1 > > mdadm --assemble --update=uuid /dev/md0 /dev/mapper/partition_1 # This > > creates a new RAID1 using the partition_1, a new array UUID is required in > > order for --assembly to work > > mdadm --manage --add /dev/md0 /dev/mapper/partition_2 # This adds > > partition_2 to the RAID1, contents of partition_1 are replicated to > > partition_2 automatically > > Your commands are strange : the partitions should be the disk partitions > from /dev and not mapped ones. Or you have another layer ? From where > come /dev/mapper/partition_1 and /dev/mapper/partition_2 ?
If I have been following along, the RAID parts are LUKS encrypted devices, so to me it does make sense. Cheers -- t
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