> Mike DeMarco wrote:
> > I currently have a zpool with two 8Gbyte disks in
> it. I need to replace them with a single 56Gbyte
> disk.
> >
> > with veritas I would just add the disk in as a
> mirror and break off the other plex then destroy it.
> >
> > I see no way of being able to do this with zfs.
> >
> > Being able to migrate data without having to
> unmount and remount filesystems is very 
> > important to me.
> >
> > Can anyone say when such functionality will be
> implemented?
> >   
> 
> If the original pool is a mirror, the it is trivial
> and has been a
> features since day one.  zpool attach the new disk.
> zpool detach the old disks.
> 
> If the original pool is not a mirror, then it can get
> more
> complicated, but depends on what you want it to look
> like in the long term...
>  -- richard
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> ss

original pool is not a mirror it consists of two disks concat. (SANS disks 
mirrored on SANS)
Looks like attach will only allow attacment to a single device in a zpool and 
not to both devices. If I attach to one of the two devices it will grow the 
pool into the whole device and then I can not remove the other device. I find 
this to be a most frustrating problem with zfs and wonder if any work is being 
done to correct such a omission.
 
 
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