Use METASLAB_WEIGHT_CLAIM weight to allocate tertiary blocks.
Preious use of METASLAB_WEIGHT_SECONDARY for that caused errors
later on metaslab_activate_allocator() call, leading to massive
load of unneeded metaslabs and write freezes.
You can view, comment on, or merge this pull request online at:

  https://github.com/openzfs/openzfs/pull/687

-- Commit Summary --

  * 9738 Fix third block copy allocations, broken at 9112.

-- File Changes --

    M usr/src/uts/common/fs/zfs/metaslab.c (12)

-- Patch Links --

https://github.com/openzfs/openzfs/pull/687.patch
https://github.com/openzfs/openzfs/pull/687.diff

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