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-m|--metadata <profile>
Specify the profile for the metadata block groups. Valid values are raid0, raid1, raid5, raid6, raid10, single or dup (case does not matter).
A single device filesystem will default to DUP, unless an SSD is detected, in which case it will default to single. The detection is based on the value of /sys/block/DEV/queue/rotational, where DEV is the short name of the device.
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