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As far as I can see Linux has RAID6 and RAID0, but not RAID60. So RAID60 is emulated by creating RAID0 on top of some RAID6s.

It is possible to add a hot spare to each of the RAID6s, but is it possible to add a global hot spare shared by all the RAID6s? If so, how can that be added to existing RAID6s that are currently assembled automatically (no mdadm.conf)?

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for what it's worth, So RAID60 is emulated by creating RAID0 on top of some RAID6s - that's exactly what RAID60 is in any controller, they just might abstract it away into being one set-up step, rather than two. – Mark Henderson♦ Sep 4 '12 at 0:22

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From http://www.kernelhardware.org/linux-add-share-hot-spare-device-software-raid/

  1. Use mdadm to hot add the new drive partition to the RAID Array
  2. Configure mdadm.conf to include spare-group setting
  3. Configure mdadm to run in daemon mode and monitor RAID Arrays

See the linked article for more in-depth details.

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As mentioned: I do not have mdadm.conf. Adapt your answer, so either mdadm.conf is generated automatically or is unneeded. – Ole Tange Sep 4 '12 at 12:19

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