SRDF splitting in DMX / Symmetrix

1. logon to emc server


2. search for the host in question and the device group (in this case host4 device group Adat3)
   # symdg list

                             D E V I C E      G R O U P S

                                                             Number of
    Name               Type     Valid  Symmetrix ID  Devs   GKs  BCVs  VDEVs

    host1_data-M       RDF1     Yes    000285700131     8     0     0      0
    host1_dumps-M      RDF1     Yes    000285700131     1     0     0      0
    host2_data-M       RDF1     Yes    000285700131     9     0     0      0
    host2_temp-M       RDF1     Yes    000285700131     6     0     0      0
    host3_data         RDF1     Yes    000285700131     8     0     0      0
    host4_Adat3        RDF1     Yes    000290100000    27     0     0      0   (this is the one we want)
    host4_Bdat3        RDF1     Yes    000290100000    12     0     0      0

3. split the device group
   # symrdf -g host4_IBM3 split

   Execute an RDF 'Split' operation for device
   group 'host4_IBM3' (y/[n]) ? y

   An RDF 'Split' operation execution is
   in progress for device group 'host4_IBM3'. Please wait...

       Suspend RDF link(s).......................................Done.
       Read/Write Enable device(s) on RA at target (R2)..........Done.

   The RDF 'Split' operation successfully executed for
   device group 'host4_IBM3'.

4. confirm the split
   # symrdf -g host4_IBM3 query

   Device Group (DG) Name             : host4_IBM3
   DG's Type                          : RDF1
   DG's Symmetrix ID                  : 000290100000


          Source (R1) View                 Target (R2) View     MODES
   --------------------------------    ------------------------ ----- ------------
                ST                  LI      ST
   Standard      A                   N       A
   Logical       T  R1 Inv   R2 Inv  K       T  R1 Inv   R2 Inv       RDF Pair
   Device  Dev   E  Tracks   Tracks  S Dev   E  Tracks   Tracks MDA   STATE
   -------------------------------- -- ------------------------ ----- ------------

   DEV001  05F8 RW       0      260 NR 06B0 RW       0        0 S..   Split
   DEV002  0608 RW       0      258 NR 06C0 RW       0        0 S..   Split
   DEV003  0618 RW       0      262 NR 06D0 RW       0        0 S..   Split
   DEV004  0628 RW       0      266 NR 06E0 RW       0        0 S..   Split
   DEV005  0638 RW       0      264 NR 06F0 RW       0        0 S..   Split

5. To reestablish the link
   # symrdf -g host4_IBM3 establish

   Execute an RDF 'Incremental Establish' operation for device
   group 'host4_IBM3' (y/[n]) ? y

   An RDF 'Incremental Establish' operation execution is
   in progress for device group 'host4_IBM3'. Please wait...

       Write Disable device(s) on RA at target (R2)..............Done.
       Suspend RDF link(s).......................................Done.
       Resume RDF link(s)........................................Started.
       Merge device track tables between source and target.......Started.
       Devices: 0778-078F ...................................... Merged.
       Devices: 0758-0777 ...................................... Merged.
       Devices: 0738-0757 ...................................... Merged.
       Devices: 0718-0737 ...................................... Merged.
       Devices: 06F8-0717 ...................................... Merged.
       Devices: 06D8-06F7 ...................................... Merged.
       Devices: 06B8-06D7 ...................................... Merged.
       Devices: 0698-06B7 ...................................... Merged.
       Devices: 0678-0697 ...................................... Merged.
       Devices: 0658-0677 ...................................... Merged.
       Devices: 0638-0657 ...................................... Merged.
       Devices: 0618-0637 ...................................... Merged.
       Devices: 05F8-0617 ...................................... Merged.
       Merge device track tables between source and target.......Done.
       Resume RDF link(s)........................................Done.

   The RDF 'Incremental Establish' operation successfully initiated for
   device group 'host4_IBM3'.