To enable the DMP support for ZFS root

1. To enable the DMP support for ZFS root, turn on the dmp_native_support tunable. The command prompts you to reboot the system if the ZFS root pool has to be migrated to DMP.

   # zpool status
     pool: rpool
    state: ONLINE
     scan: resilvered 24.6G in 0h4m with 0 errors on Tue Feb 5 
           17:56:57 2013
   config:
        NAME                         STATE    READ WRITE CKSUM
        rpool                        ONLINE      0     0     0
            c4t50060E8006D43C30d4s0  ONLINE      0     0     0

   # vxdmpadm settune dmp_native_support=on
   VxVM vxdmpadm INFO V-5-1-0 DMP Native Support is enabled 
   for root pool. Please reboot the system for changes to 
   take effect.

   On system reboot, the ZFS root pool starts using DMP devices.

2. To make the system bootable from any of the paths of the DMP devices, set the eeprom boot-device variable to the paths of the DMP devices.

   See Updating the boot device settings.

3. Use ZFS utilities like zpool and zdb to verify that DMP devices are shown under the root pool.

   # zpool status rpool
     pool: rpool
    state: ONLINE
     scan: resilvered 24.6G in 0h4m with 0 errors on Tue Feb 
           5 17:56:57 2013
   config:
        NAME                      STATE    READ WRITE CKSUM
             rpool                ONLINE      0     0     0
             hitachi_vsp0_00f4s0  ONLINE      0     0     0
   
   errors: No known data errors
   
   
   # zdb -C rpool
   
   MOS Configuration:
           version: 34
           name: 'rpool'
           state: 0
           txg: 291980
           pool_guid: 10008700897979933591
           timestamp: 1360279240
           hostid: 2224483892
           hostname: 'sfqasol68'
           vdev_children: 1
           vdev_tree:
               type: 'root'
               id: 0
               guid: 10008700897979933591
               create_txg: 4
               children[0]:
                   type: 'disk'
                   id: 0
                   guid: 2845745816652566832
                   path: '/dev/dsk/hitachi_vsp0_00f4s0'
                   devid: 'id1,dmp@x001738000e9523e4/x001738000e9523e4-a'
                   phys_path: '/pseudo/vxdmp@0:x001738000e9523e4-a'
                   whole_disk: 0
                   metaslab_array: 27
                   metaslab_shift: 28
                   ashift: 9
                   asize: 32195739648
                   is_log: 0
                   DTL: 606
                   create_txg: 

To disable the ZFS root support

1. To disable the ZFS root support, turn off the dmp_native_support as shown below:

   # vxdmpadm settune dmp_native_support=off
   VxVM vxdmpadm INFO V-5-1-0 DMP Native Support is disabled 
   for root pool. Please reboot the system for changes to 
   take effect.

2. On system reboot, ZFS root pool will show OS devices.

   # zpool status
     pool: rpool
    state: ONLINE
     scan: resilvered 24.6G in 0h4m with 0 errors on Tue Feb 5
           17:56:57 2013
   config:
        NAME                          STATE     READ WRITE CKSUM
             rpool                    ONLINE       0     0     0
             c4t50060E8006D43C30d4s0  ONLINE       0     0     0