Like in the title. It appears that I cannot add zfs.block_mode: 'true' to the “root” device, as I’m getting “Invalid device option” error. Is there a way to set the block mode through the profile?
Not currently, we are planning on adding support for that soon.
In the meantime, for instances, it has to be enabled at the pool level when the instance is created, but it can then be disabled afterwards. Custom volumes can specify the zfs.block_mode setting directly at create time though.
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