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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Example: Setting up SRDF/Metro (Array Witness method)

About this task

This example shows the steps to set up SRDF/Metro using a witness array. The following image shows the initial configuration:
  • The array that will become the R1 side is mapped/masked to the host.
  • The array that will become the R2 side is NOT mapped/masked to the host.
Figure 1. Setting up SRDF/Metro with Witness array; Before

Steps

  1. On the host, use the symcli command to verify the version of Solutions Enabler is 8.1 or later.
  2. Use the symrdf addgrp command to create Witness SRDF groups between SIDs 475/105 and 039/105: 
     symrdf addgrp -witness -label SG_120 -sid 000196700475 -rdfg 120 -dir 1F:10,1F:11 -remote_sid 000197200105 -remote_rdfg 120 -remote_dir 9F:8,9F:9
 
Successfully Added Dynamic RDF Group 'SG_120' for Symm: 000196700475

 symrdf addgrp -witness -label SG_121 -sid 000197200039 -rdfg 121 -dir 3F:10,4F:10 -remote_sid 000197200105 -remote_rdfg 121 -remote_dir 10F:8,10F:9
 
Successfully Added Dynamic RDF Group 'SG_121' for Symm: 000197200039
  3. Use the symrdf addgrp command to create the SRDF group for the SRDF pairs between SIDs 475 and 039: 
    symrdf addgrp -label SG_20 -sid 000196700475 -rdfg 20 -dir 3F:30,3F:31,4F:30,4F:31 -remote_sid 000197200039 -remote_rdfg 20 -remote_dir 3F:10,3F:11,4F:10,4F:11

Successfully Added Dynamic RDF Group 'SG_20' for Symm: 000196700475
  4. Use the createpair command with the -metro option to create SRDF/Metro device pairs. The file rdfg20 defines the device pairs.
    To create SRDF/Metro device pairs in local group 20 and remote group 20: 
    symrdf -sid 000196700475 -rdfg 20 -f rdfg20 createpair -type r1 -metro -establish

An RDF 'Create Pair' operation execution is in progress for device
file 'rdfg20'. Please wait...

    Create RDF Pair in (0475,020)....................................Started.
    Create RDF Pair in (0475,020)....................................Done.
    Mark target device(s) in (0475,020) for full copy from source....Started.
    Devices: 00D0-00D7 in (0475,020).................................Marked.
    Mark target device(s) in (0475,020) for full copy from source....Done.
    Merge track tables between source and target in (0475,020).......Started.
    Devices: 00D0-00D7 in (0475,020).................................Merged.
    Merge track tables between source and target in (0475,020).......Done.
    Resume RDF link(s) for device(s) in (0475,020)...................Started.
    Resume RDF link(s) for device(s) in (0475,020)...................Done.

The RDF 'Create Pair' operation successfully executed for device
  5. Wait for the device pairs to reach the ActiveActive state: 
    symrdf -sid 000196700475 -rdfg 20 -f rdfg20 verify -activeactive -i 15

None of the device(s) in the list are in 'ActiveActive' state.

All device(s) in the list are in 'ActiveActive' state.
  6. Use symcfg list commands with the -metro option to display the SRDF groups.
    To display group 20 on SID 475: 
    symcfg -sid 475 -rdfg 20 -metro list

Symmetrix ID : 000196700475
                S Y M M E T R I X   R D F   G R O U P S
    Local             Remote                  Group               RDF Metro
------------ --------------------- --------------------------- -----------------
          LL                                       Flags   Dir    Witness
 RA-Grp  sec  RA-Grp  SymmID       ST    Name    LPDS CHTM Cfg CE S Identifier
------------ --------------------- --------------------------- -- --------------
 20 (13)  10  20 (13) 000197200039 OD SG_20      XX.. ..XX F-S WW N 000197200105

Legend:
  Group (S)tatus    :  O = Online, F = Offline
  Group (T)ype      :  S = Static, D = Dynamic, W = Witness
  Director (C)onfig :  F-S = Fibre-Switched, F-H = Fibre-Hub
                       G = GIGE, E = ESCON, T = T3, - = N/A
  Group Flags       :
      Prevent Auto (L)ink Recovery      : X = Enabled, . = Disabled
      Prevent RAs Online Upon (P)ower On: X = Enabled, . = Disabled
      Link (D)omino                     : X = Enabled, . = Disabled
      (S)TAR/SQAR mode                  : N = Normal, R = Recovery, . = OFF
                                          S = SQAR Normal, Q = SQAR Recovery
      RDF Software (C)ompression        : X = Enabled, . = Disabled, - = N/A
      RDF (H)ardware Compression        : X = Enabled, . = Disabled, - = N/A
      RDF Single Round (T)rip           : X = Enabled, . = Disabled, - = N/A
      RDF (M)etro                       : X = Configured, . = Not Configured
  RDF Metro Flags   :
      (C)onfigured Type                 : W = Witness, B = Bias, - = N/A
      (E)ffective Type                  : W = Witness, B = Bias, - = N/A
      Witness (S)tatus                  : N = Normal, D = Degraded,
                                          F = Failed, - = N/A
    To display all groups, showing their SRDF/Metro information on SID 039: 
    symcfg list –rdfg all -sid 039 –metro

Symmetrix ID : 000197200039

                S Y M M E T R I X   R D F   G R O U P S

    Local             Remote                  Group               RDF Metro
------------ --------------------- --------------------------- -----------------
          LL                                       Flags   Dir    Witness
 RA-Grp  sec  RA-Grp  SymmID       ST    Name    LPDS CHTM Cfg CE S Identifier
------------ --------------------- --------------------------- -- --------------
 20 (13)  10  20 (13) 000196700475 OD SG_20      XX.. ..XX F-S WW N 000197200105
116 (73)  10 119 (76) 000197100086 OD sdp_dg7    XX.. ..XX F-S WW N Wit084086
117 (74)  10 120 (77) 000197100086 OD sdp_dg9    XX.. ..XX F-S BB - -
121 (78)  10 121 (78) 000197200039 OW SG_121     XX.. ..X. F-S WW N 000197200105
    To display group 20 on SID 039: 
    symcfg -sid 039 -rdfg 20 -metro list

Symmetrix ID : 000197200039

                S Y M M E T R I X   R D F   G R O U P S

    Local             Remote                  Group               RDF Metro
------------ --------------------- --------------------------- -----------------
          LL                                       Flags   Dir    Witness
 RA-Grp  sec  RA-Grp  SymmID       ST    Name    LPDS CHTM Cfg CE S Identifier
------------ --------------------- --------------------------- -- --------------
 20 (13)  10  20 (13) 000196700475 OD SG_20      XX.. ..XX F-S WW N 000197200105
    To display all groups on SID 105: 
    symcfg -sid 105 -rdfg all list

Symmetrix ID : 000197200105

S Y M M E T R I X   R D F   G R O U P S

    Local             Remote                  Group                RDFA Info
------------ --------------------- --------------------------- ---------------
          LL                                       Flags   Dir Flags Cycle
 RA-Grp  sec  RA-Grp  SymmID       ST    Name    LPDS CHTM Cfg CSRM  time  Pri
------------ --------------------- --------------------------- ----- ----- ---
120 (77)   1 120 (77) 000196700475 OW SG_120     XX.. ..X. F-S -IS-     15  33
121 (78)   1 121 (78) 000197200039 OW SG_121     XX.. ..X. F-S -IS-     15  33
  7. Query the device pairs: 
    symrdf -sid 000196700475 -rdfg 20 -f rdfg20 query

Symmetrix ID                 : 000196700475    (Microcode Version: 5977)
Remote Symmetrix ID          : 000197200039    (Microcode Version: 5977)
RDF (RA) Group Number        :  20 (13)
        Source (R1) View                 Target (R2) View     MODE
---------------------------------    ------------------------ ---- ------------
               ST                 LI       ST
Standard        A                  N        A
Logical  Sym    T R1 Inv  R2 Inv   K Sym    T R1 Inv  R2 Inv       RDF Pair
Device   Dev    E Tracks  Tracks   S Dev    E Tracks  Tracks  MACE STATE
--------------------------------- -- ------------------------ ---- ------------
N/A      000D0 RW       0       0 RW 000F0 RW       0       0 T.X. ActiveActive
N/A      000D1 RW       0       0 RW 000F1 RW       0       0 T.X. ActiveActive
N/A      000D2 RW       0       0 RW 000F2 RW       0       0 T.X. ActiveActive
N/A      000D3 RW       0       0 RW 000F3 RW       0       0 T.X. ActiveActive
N/A      000D4 RW       0       0 RW 000F4 RW       0       0 T.X. ActiveActive
N/A      000D5 RW       0       0 RW 000F5 RW       0       0 T.X. ActiveActive
N/A      000D6 RW       0       0 RW 000F6 RW       0       0 T.X. ActiveActive
N/A      000D7 RW       0       0 RW 000F7 RW       0       0 T.X. ActiveActive

Total             ------- -------             ------- -------
  Track(s)              0       0                   0       0
  MB(s)               0.0     0.0                 0.0     0.0
  8. After the pairs have reached ActiveActive state, display the WWNs to verify the R1 WWNs and the non-native device WWNs on the R2 are the same: 
    symdev list -sid 475 -wwn -devs d0:d3

Symmetrix ID: 000196700475
        Device Name                               Device
---------------------------- --------------------------------------------------
Sym   Physical               Config       Attr WWN
---------------------------- --------------------------------------------------
000D0 Not Visible            RDF1+TDEV         60000970000196700475533030304430
000D1 Not Visible            RDF1+TDEV         60000970000196700475533030304431
000D2 Not Visible            RDF1+TDEV         60000970000196700475533030304432
000D3 Not Visible            RDF1+TDEV         60000970000196700475533030304433



symdev list -sid 039 -wwn_non_native -devs f0:f3

Symmetrix ID: 000197200039
        Device Name                               Device
---------------------------- --------------------------------------------------
Sym   Physical               Config       Attr Non-Native WWN
---------------------------- --------------------------------------------------
000F0 Not Visible            RDF2+TDEV         60000970000196700475533030304430
000F1 Not Visible            RDF2+TDEV         60000970000196700475533030304431
000F2 Not Visible            RDF2+TDEV         60000970000196700475533030304432
000F3 Not Visible            RDF2+TDEV         60000970000196700475533030304433
    NOTE:
    • For an R1 device, the symdev list -wwn_non_native command does not show anything. (In case a set bias R2 or suspend -keep R2 was done, the new R1 has the identity of the original R1 (and the new R2/original R1) has no -wwn_non_native.)
    • The symdev show command for the R2 device shows its native WWN (Device WWN field) and its external WWN (Device External Identity/Device WWN field).
    • The second WWN (Device External Identity) should match the native WWN of its R1 partner, and should also be the value displayed by the symdev list -non_native_wwn command.
  9. Map and mask the R2 devices to the host and access additional paths to the devices.

    The following image shows the final SRDF/Metro configuration.

    Figure 2. Setting up SRDF/Metro with Witness array; After

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