The answer is that an SMI label is required in which the first slice  
covers the whole disk. A detailed process is described at:

        http://www.castro.aus.net/~maurice/opensolaris/zfsbootmirror.html

Please note that there still may be other issues ie bug 6680633 but at  
least I can now add an identical disk to the mirror.

        Maurice Castro

On 19/06/2008, at 2:31 PM, Maurice Castro wrote:

> Hi All,
>       I have just installed b90 on an E250 with 2 identical SCSI disks and
> zfs root. But I keep getting the error
>
>       cannot attach /dev/rdsk/c0t8d0 to c0t0d0s0: device is too small
>
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