Unable to pass metadata argument to curtin RAID command

[Mark Maglana]

When defining a RAID device via MaaS, there is no field/argument that allows for passing the metadata argument to curtin (https://curtin.readthedocs.io/en/latest/topics/storage.html#raid-command). This is critical in situations where Intel VROC is used to create a RAID device out of NVMe storage. More specifically, SuperMicro X11 boards with Intel VROC require that the `mdadm` command be passed a `--metadata=imsm` option.

How to recreate
1. Go to the storage tab of any machine in the Maas UI
2. Select 2 or more disks
3. Click Create RAID

The form displayed does not have any provision for passing the `metadata` key to curtin.

MaaS version: 2.9.0 (9137-g.8e920a12b)

[Mark Maglana (mmaglana)]

Attaching a copy of the SuperMicro guide for setting up Intel VROC RAID devices. Kindly see section 7.3 of the doc. Source: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiDtu6yv5juAhXIDaYKHYcrAIcQFjAKegQIGBAC&url=https%3A%2F%2Fwww.supermicro.org.cn%2Fmanuals%2Fother%2FAOC-VROCxxxMOD.pdf&usg=AOvVaw1zZnqCmbacURdkFwS5iqJU

[Christian Grabowski (cgrabowski)]

Hi there, this is more of a feature request than a bug report. Could you please file a feature request by creating a new topic in discourse under the feature category here: https://discourse.maas.io/