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

Subject: Re: [zfs-discuss] Mixing RAID levels in a pool
From: Tomas Ögren
Date: Sun, 8 Jun 2008 02:31:36 +0200
On 07 June, 2008 - Fu Leow sent me these 1,1K bytes:

> 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.

Currently, yes. It's being worked on as far as I know.

/Tomas
-- 
Tomas Ögren, stric@xxxxxxxxxx, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Umeå
`- Sysadmin at {cs,acc}.umu.se
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