zfs discuss - Oct 2009 - root pool can not have multiple vdevs ?

This seems like a bit of a restriction ... is this intended ?

# cat /etc/release
                 Solaris Express Community Edition snv_125 SPARC
           Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
                        Use is subject to license terms.
                            Assembled 05 October 2009

# uname -a
SunOS neptune 5.11 snv_125 sun4u sparc SUNW,Sun-Fire-880

# zpool status
  pool: neptune_rpool
 state: ONLINE
 scrub: none requested
config:

        NAME          STATE     READ WRITE CKSUM
        neptune_rpool  ONLINE       0     0     0
          mirror-0    ONLINE       0     0     0
            c1t0d0s0  ONLINE       0     0     0
            c1t3d0s0  ONLINE       0     0     0

errors: No known data errors

Now I want to add two more mirrors to that pool because the V880 has more
drives to offer, that are not used at the moment.

So I''d like to add in a mirror of c1t1d0 and c1t4d0 :

# zpool add -f neptune_rpool c1t1d0
cannot label ''c1t1d0'': EFI labeled devices are not supported
on root pools.

OKay .. I can live with that.

# prtvtoc -h /dev/rdsk/c1t0d0s0 | fmthard -s - /dev/rdsk/c1t1d0s0
fmthard:  New volume table of contents now in place.
# prtvtoc -h /dev/rdsk/c1t0d0s0 | fmthard -s - /dev/rdsk/c1t4d0s0
fmthard:  New volume table of contents now in place.

# zpool add -f neptune_rpool c1t1d0s0
cannot add to ''neptune_rpool'': root pool can not have multiple
vdevs or
separate logs

So essentially there is no way to grow that zpool. Is this the case?

-- 
Dennis

On Tue, Oct 27, 2009 at 4:39 PM, Dennis Clarke <dclarke at blastwave.org>
wrote:
> So essentially there is no way to grow that zpool. Is this the case?
There''s the option of getting a bigger disk and do a send - receive.
I''m guessing the restriction is necessary for simplicity sake to allow
bootloaders work with zfs root.

-- 
Fajar

>On Tue, Oct 27, 2009 at 4:39 PM, Dennis Clarke <dclarke at
blastwave.org> wrote:
>> So essentially there is no way to grow that zpool. Is this the case?
>
>There''s the option of getting a bigger disk and do a send -
receive.
>I''m guessing the restriction is necessary for simplicity sake to
allow
>bootloaders work with zfs root.

You can grow your slice (I have done that) but that does require space
after your slice.

Casper