On 09/19/2016 12:32 PM, Anthony DeRobertis wrote:
(please cc me, I'm not subscribed.)

mdadm 3.4 can not manage to add a spare to my array, it fails like:

    # mdadm -a /dev/md/pv0 /dev/sdc3
    mdadm: add new device failed for /dev/sdc3 as 8: Invalid argument

and the kernel logs:

    md: sdc3 does not have a valid v1.0 superblock, not importing!
    md: md_import_device returned -22

This worked in 3.3.4. I performed two git bisects and found that:

a) it was broken by 95a05b37e8eb2bc0803b1a0298fce6adc60eff16
b) it is sort-of fixed by 81306e021ebdcc4baef866da82d25c3f0a415d2d
    (which AFAIK isn't yet released)

I say sort of fixed in that it adds it to the array, but spits out some
worrying errors (and I have no idea if it'd actually work, e.g., if it'd
assemble again):

    # ./mdadm -a /dev/md/pv0 /dev/sdc3
    mdadm: Warning: cluster md only works with superblock 1.2
    mdadm: Failed to write metadata to /dev/sdc3

Thanks for report, could you try the latest tree git://git.kernel.org/pub/scm/utils/mdadm/mdadm.git? I guess 45a87c2f31335a759190dff663a881bc78ca5443 should resolve it , and I can add a spare disk
to native raid (internal bitmap) with different metadatas (0.9, 1.0 to 1.2).

Pls let me know the result, I will look into it if the issue still exists.


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