Re: Does mdadm --create harm existing data?

On Saturday December 3, aab@cichlid.com wrote:

In mail.linux.raid I write:

quoted

Other than the superblocks, does 'mdadm --create' harm existing data?

It would seem not according to this test:

If resync starts (as it normally does with mdadm --create), and if you
assembled the array 'wrongly', then you could possibly corrupt data.
If you want to be cautious, always create the array degraded (with a
suitable number of 'missing' entries).  Then you can be sure that only
the superblocks will be changed.

NeilBrown