i found some tasks to do, to get more information about the problem.

zpool import tank  tells me:
cannot import 'tank': pool may be in use from other system
use '-f' to import anyway

zpool import -f tank 
cannot import 'tank': no such pool or dataset


using zpool import 
fmdump -eV gives me 

Nov 30 2008 18:46:00.785185192 ereport.fs.zfs.io
nvlist version: 0
        class = ereport.fs.zfs.io
        ena = 0xac6f8268a900401
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = zfs
                pool = 0xeded501105d65329
                vdev = 0x14c7450257f00831
        (end detector)

        pool = tank
        pool_guid = 0xeded501105d65329
        pool_context = 2
        vdev_guid = 0x14c7450257f00831
        vdev_type = missing
        parent_guid = 0xeded501105d65329
        parent_type = root
        zio_err = 48
        zio_offset = 0x4000
        zio_size = 0x1c000
        __ttl = 0x1
        __tod = 0x4932d158 0x2eccf9a8

Nov 30 2008 18:46:00.785185783 ereport.fs.zfs.io
nvlist version: 0
        class = ereport.fs.zfs.io
        ena = 0xac6f8268a900401
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = zfs
                pool = 0xeded501105d65329
                vdev = 0x14c7450257f00831
        (end detector)

        pool = tank
        pool_guid = 0xeded501105d65329
        pool_context = 2
        vdev_guid = 0x14c7450257f00831
        vdev_type = missing
        parent_guid = 0xeded501105d65329
        parent_type = root
        zio_err = 48
        zio_offset = 0x44000
        zio_size = 0x1c000
        __ttl = 0x1
        __tod = 0x4932d158 0x2eccfbf7

Nov 30 2008 18:46:00.785186231 ereport.fs.zfs.io
nvlist version: 0
        class = ereport.fs.zfs.io
        ena = 0xac6f8268a900401
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = zfs
                pool = 0xeded501105d65329
                vdev = 0x14c7450257f00831
        (end detector)

        pool = tank
        pool_guid = 0xeded501105d65329
        pool_context = 2
        vdev_guid = 0x14c7450257f00831
        vdev_type = missing
        parent_guid = 0xeded501105d65329
        parent_type = root
        zio_err = 48
        zio_offset = 0x3f84000
        zio_size = 0x1c000
        __ttl = 0x1
        __tod = 0x4932d158 0x2eccfdb7

Nov 30 2008 18:46:00.785185402 ereport.fs.zfs.io
nvlist version: 0
        class = ereport.fs.zfs.io
        ena = 0xac6f8268a900401
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = zfs
                pool = 0xeded501105d65329
                vdev = 0x14c7450257f00831
        (end detector)

        pool = tank
        pool_guid = 0xeded501105d65329
        pool_context = 2
        vdev_guid = 0x14c7450257f00831
        vdev_type = missing
        parent_guid = 0xeded501105d65329
        parent_type = root
        zio_err = 48
        zio_offset = 0x3fc4000
        zio_size = 0x1c000
        __ttl = 0x1
        __tod = 0x4932d158 0x2eccfa7a

Nov 30 2008 18:46:00.785185312 ereport.fs.zfs.zpool
nvlist version: 0
        class = ereport.fs.zfs.zpool
        ena = 0xac6f8268a900401
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = zfs
                pool = 0xeded501105d65329
        (end detector)

        pool = tank
        pool_guid = 0xeded501105d65329
        pool_context = 2
        __ttl = 0x1
        __tod = 0x4932d158 0x2eccfa20



So both devices have still two valid labels. But only one is still recognized 
for an import.
I found this thread:  
http://www.opensolaris.org/jive/thread.jspa?messageID=220125

But the level is a little bit to high, I really do not know where to find the 
valid uberblock.

A also read about a new labeling with format -e and setup of a new EFI-Label.

Any more suggestions?
-- 
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