I have a server, with two external drive cages attached, on separate 
controllers:

c0::dsk/c0t0d0                 disk         connected    configured   unknown
c0::dsk/c0t1d0                 disk         connected    configured   unknown
c0::dsk/c0t2d0                 disk         connected    configured   unknown
c0::dsk/c0t3d0                 disk         connected    configured   unknown
c0::dsk/c0t4d0                 disk         connected    configured   unknown
c0::dsk/c0t5d0                 disk         connected    configured   unknown
c0::dsk/c0t6d0                 disk         connected    configured   unknown
c0::dsk/c0t7d0                 disk         connected    configured   unknown
c0::dsk/c0t8d0                 disk         connected    configured   unknown
c0::dsk/c0t9d0                 disk         connected    configured   unknown
c0::dsk/c0t10d0                disk         connected    configured   unknown
c0::dsk/c0t11d0                disk         connected    configured   unknown

c1::dsk/c1t1d0                 disk         connected    configured   unknown
c1::dsk/c1t2d0                 disk         connected    configured   unknown
c1::dsk/c1t3d0                 disk         connected    configured   unknown
c1::dsk/c1t4d0                 disk         connected    configured   unknown
c1::dsk/c1t5d0                 disk         connected    configured   unknown
c1::dsk/c1t6d0                 disk         connected    configured   unknown
c1::dsk/c1t7d0                 disk         connected    configured   unknown
c1::dsk/c1t8d0                 disk         connected    configured   unknown
c1::dsk/c1t9d0                 disk         connected    configured   unknown
c1::dsk/c1t10d0                disk         connected    configured   unknown
c1::dsk/c1t11d0                disk         connected    configured   unknown

It would be nice to create a setup similar to

zpool create sub1 raidz c0t0d0 c0t1d0 c0t2d0 c0t3d0 c0t4d0 c0t5d0
zpool add sub1 raidz c0t6d0 c0t7d0 c0t8d0 c0t9d0 c0t10d0 c0t11d0

zpool create sub2 raidz c1t0d0 c1t1d0 c1t2d0 c1t3d0 c1t4d0 c1t5d0
zpool add sub2 raidz c1t6d0 c1t7d0 c1t8d0 c1t9d0 c1t10d0 c1t11d0

zpool create pool mirror sub1 sub2

As I could lose a HDD in either external drive cage, or indeed a whole external 
drive cage (controller/cable/power) without downtime.

But I have a feeling I can not do this? What would be recommended?
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