sol11 zfs, swap & zone creation woes

I want to create a new sol10 zone on a sol11 sparc system.

I get a message stating that i don't have have memory.  Really?  Seriously?  What *are* they doing?

# swap -s -h

205M available. 

Whoops.  That's all me.

What to do?  Create a swap file.  Sure.  Let's do the usual, shall we?

# mkfile 5g /swap
# swap -a /swap
"/swap" may contain holes - can't swap on it.

Oh come on.  Silly zfs filesystem.  Sigh.

Well.  Let's see where we can put a swap file...

# zfs list

...
rpool/export                                           43.5G  68.4G    34K  /export
rpool/export/home                                      66K    68.4G    32K  /export/home
rpool/export/home/localuser                            34K    68.4G    34K  /export/home/localuser
rpool/export/zones                                     43.5G  68.4G    43K  /export/zones
...

Well.  zones looks as good a place as any.  So, it is a device; and the device is here:
/dev/zvol/dsk/rpool/export/zones
We just know this because that's zfs.

Let's script it, shall we?  Just in case we need to do this again.  One shot.  Create it, activate it, mount it.

if [ ! -L /dev/zvol/dsk/rpool/export/zones/swap ]
then
       zfs create -V 5gb rpool/export/zones/swap
fi
echo "/dev/zvol/dsk/rpool/export/zones/swap -  -  swap  -  no   -" >> /etc/vfstab
/usr/sbin/swap -a /dev/zvol/dsk/rpool/export/zones/swap
mount -a

# swap -s -h
total: 2.0G allocated + 1.3G reserved = 3.3G used, 5.3G available

Awesome.

And now the creation of that zone...
# ./solaris-10u10-sparc.bin -p /export/zones -a 10.10.10.10/20 -z sol10vm

Happiness.