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Blivet currently sets default chunk size (512 KiB) for all raid levels. RAID 1 doesn't use chunks and when creating a RAID 1 array using mdadm the --chunk option used to be silently ignored but starting with mdadm-4.2-rc1_4 this results in an error and the array is not created so we need to stop setting chunk size when creating RAID 1 arrays.

```
# mdadm --create --run md127 --chunk 512 --level raid1 --raid-devices 2 /dev/sdb1 /dev/sdb2 --metadata=1.0                         
mdadm: specifying chunk size is forbidden for this level
```

upstream PR: https://github.com/storaged-project/blivet/pull/969

*** Bug 1990757 has been marked as a duplicate of this bug. ***

*** Bug 1989958 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (python-blivet bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4297