Can partitions span more than one drive?

[Nikos Vassiliadis]

Ruben de Groot wrote:
> On Wed, Aug 26, 2009 at 04:56:03PM +0300, Nikos Vassiliadis typed:
>> RW wrote:
>>> On Wed, 26 Aug 2009 08:45:47 -0400
>>> John Almberg <jalmberg at identry.com> wrote:
>>>
>>>
>>>> Question: is it possible to just expand my existing /backup
>>>> partition to encompass both the current drive and the new drive? I'm
>>>> guessing not, since Chapter 8 in "Absolute FreeBSD" says that a
>>>> partition is part of a slice, 
>>> You can join 2 partitions into 1 with gconcat. OTOH that would wipe any
>>> existing data as you would need to put a new filesystem on the combined
>>> partition.
>> No, you can always use growfs to expand the filesystem.
>> But of course, the usual warnings apply, read carefully the
>> growfs manual...
> 
> You can not use growfs to expand a gconcat provider to the new gconcat device.

What I mean is:
1) you have a filesystem on device A and a spare disk device B
2) concatenate A and B using gconcat
3) growfs the fs in the concatenated device and you are done.

Nikos