[bug #43653] grub-probe fails to find ZFS VDEVs in /dev/mapper

[Jonathan Vaughn]

Follow-up Comment #7, bug #43653 (project grub):

Instead of 'zpool status POOL', more useful information could be gleaned from
'zdb -C POOL'. Among other things, zdb provides the full device path for each
member of the pool. 
For comparison, using zpool: 


address@hidden /]# zpool status rpool
  pool: rpool
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not
support
        the features. See zpool-features(5) for details.
  scan: none requested
config:

        NAME                                      STATE     READ WRITE CKSUM
        rpool                              ONLINE       0     0     0
          ata-TOSHIBA_DT01ACA050_999999999-part1  ONLINE       0     0     0

errors: No known data errors


And using zdb: 


address@hidden /]# zdb -C rpool

MOS Configuration:
        version: 5000
        name: 'rpool'
        state: 0
        txg: 4
        pool_guid: 11603639135903192856
        errata: 0
        hostname: 'localhost'
        vdev_children: 1
        vdev_tree:
            type: 'root'
            id: 0
            guid: 11603639135903192856
            create_txg: 4
            children[0]:
                type: 'disk'
                id: 0
                guid: 13527569036254253061
                path:
'/dev/disk/by-id/ata-TOSHIBA_DT01ACA050_999999999-part1'
                whole_disk: 0
                metaslab_array: 34
                metaslab_shift: 32
                ashift: 12
                asize: 499565199360
                is_log: 0
                create_txg: 4
        features_for_read:



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