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Re: [zfs-discuss] Mixing RAID levels in a pool

Subject: Re: [zfs-discuss] Mixing RAID levels in a pool
From: "Fu Leow"
Date: Sat, 7 Jun 2008 14:06:47 -0700
On Sat, Jun 7, 2008 at 4:13 AM, Mario Goebbels <me@xxxxxxxxxxx> wrote:
>> c1t5d0 was part of a mirror but with c1t4d0 removed it now appears as
>> a single drive. Is there a way to recover from this by recreating the
>> mirror with c1t4d0?
>
> Detaching a drive from a two-way mirror effectively breaks it up and
> turns it into a single drive. That's normal. Just attach it back to
> c1t5d0 and it'll become a mirror again.
>
> Retry your experiment by detaching a drive from the RAID-Z array and
> you'll see what you were expecting.
>
> -mg
>

Thank you Tomas and Mario. I was able to recreate the mirror by reattaching.

It seems that once a vdev has been added to a pool it is no longer
possible to remove it. Is that right? For example if I created a pool
that consisted of 3 single drives there would not be a way to remove a
drive and reduce the number of devices in a pool from 3 to 2. Even if
there is enough space in those 2 remaining drives to hold all the
data.
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