Re: [gentoo-user] Converting to mirror - filesystem maintained or need to restore

[Neil Bothwick]

On Sat, 18 Mar 2017 13:29:36 +1100, Adam Carter wrote:

> IIRC when you add a device to a mirror say with;
> mdadm --create --verbose /dev/md127 --level=mirror --raid-devices=1
> --force /dev/sdb3
>
> I thought the filesystem is maintained and so /dev/md127 should be
> immediately mountable, however, it doesnt mount.
> mount: wrong fs type, bad option, bad superblock on /dev/md127,
>        missing codepage or helper program, or other error

You have created a block device at /dev/md127 but you haven't created a
filesystem on it, there's nothing to mount.

Unless you are trying to add a device to an existing array, in which case
you shouldn't be using --create.


-- 
Neil Bothwick

I locked my coathanger in my car; good thing I had a key.