Re: Can I add a raidz vdev as a mirror of existing vdevs

Found an answer to this on facebook of all places .......

https://www.facebook.com/notes/unix-in-egypt/converting-zfs-2-way-mirror-to-a-raidz-array-wihtout-losing-data/10151919826687996/

My initial reaction was going to be 'no'....but after reading this, it does
seem it is possible.
I've never done it personally, but with proper backups .... why not?

Thanks,
Paul Procacci

On Sat, Jan 8, 2022 at 9:13 PM Mel Pilgrim <list_freebsd@bluerosetech.com>
wrote:

> I have a zpool with a "stripe of mirrors" structure:
>
> mech
>    mirror-0
>      disk0
>      disk1
>    mirror-1
>      disk2
>      disk3
>    ...
>
> I want to convert it from mirrors to raidz as part of an upgrade, with
> the final form looking something like this:
>
> mech
>    raidz-0
>      disk20
>      disk21
>      ...
>
> I'd like to be able to attach the new raidz vdev as a mirror to the
> entire pool, have it silver, then detach the old vdevs.  Is this at all
> possible?  I'd rather not create a whole new pool and copy everything
> over because doing so would require downtime.
>
>

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