How do I rename an mdadm raid array?

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Start with mdadm --detail /dev/md127:

Version : 0.90
Creation Time : Wed Apr 13 20:03:21 2011
Raid Level : raid10
Array Size : 656765952 (626.34 GiB 672.53 GB)
Used Dev Size : 437843968 (417.56 GiB 448.35 GB)
Raid Devices : 3
Total Devices : 2
Preferred Minor : 8
Persistence : Superblock is persistent

The first line shows the metadata version used by this array.
Now, stop the array:

mdadm --stop /dev/md127
mdadm --remove /dev/md127

And assemble it again using the new name. If the metadata version is 1.0 or higher, use this:

mdadm --assemble /dev/md3 /dev/sd[abcdefghijk]3 --update=name

For arrays using old metadata structure (most likely 0.90, as it allows for kernel auto-assembly), use this:

mdadm --assemble /dev/md3 --update=super-minor /dev/sd[abcdefghijk]3

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