> when I tried to create a pool (called group) with four 1TB disk in
> raidz and two 500GB disk in mirror configuration to the same pool ZFS
> complained and said if I wanted to do it I had to add a -f 

Honestly, I'm surprised by that.  I would think it's ok.  I am surprised by
the -f, just as you are.


> If one 500GB disk dies (c10dX) in the mirror and I choose not to
> replace it, 

Don't do that.  You cannot remove vdev's from your pool.  If one half of the
mirror dies, you're now degraded, and if the 2nd half dies, you lose your
pool.  You cannot migrate data out of the failing mirror onto the raidz,
even if there's empty space.

I'm sure the ability to remove vdev's will be created some day ... but not
yet.


> Would this configuration survive a two disk failure if the disk are in

Yup, no problem.  Lose 1 disk in the raidz, and 1 disk in the mirror is ok.
Just don't lose 2 disks from the same vdev at the same time.

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