RAID type migrations

Can I change the RAID type after the data was written on the array?

Tom's Hardware answers "No"

In fact, it depends on the particular RAID implementation.

  • In some implementations you can change nothing.

  • In others, you can extend an array by adding new disks.

  • There are also the implementations which allow you to even change the array
    type (although not in all combinations).

You need to consult your particular hardware and/or software manual for a list of available options before committing to a certain expansion plan. In any case, make sure to backup the array contents before expanding or migrating to the different array type. Should the migration process fail midway, the RAID recovery is not going to be cheap.

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