Reversing the GAD P-VOL and S-VOL (GAD+UR)

Global Active Device for VSP One Block

Version
10.5.x
File Size
25537 KB
Audience
anonymous
Part Number
MK-23VSP1B011-11
ft:lastEdition
2026-06-23

Use the following procedure to reverse the GAD P-VOL and S-VOL when sharing GAD volumes with UR in a GAD 3DC delta resync (GAD+UR) configuration.

  1. Suspend the GAD pair by specifying the S-VOL (swap suspend).

    Command example: pairsplit -g oraHA -RS -IH0

  2. Resynchronize the GAD pair by specifying the S-VOL (swap resync).

    Command example: pairresync -g oraHA -swaps -IH0

    If a failure occurs after the one volume capacity of a GAD pair can be expanded, the creation, resync, swap resync, and horctakeover operations of the GAD pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.

    The volume on the primary storage system changes to a P-VOL, and the volume on the GAD secondary storage system changes to an S-VOL.

  3. Keep updating I/O from the server to the P-VOL or S-VOL of the GAD pair for about two minutes.
  4. Confirm that the UR delta resync P-VOL pair status is PSUS.

    Command example:

    pairdisplay -g oraDELTA -fxce -IH0
    Group     PairVol(L/R)  (Port#,TID, LU),Seq#,  LDEV#.P/S,  
    Status,Fence, %,  P-LDEV#  M  CTG  JID  AP  EM  E-Seq#  E-LDEV#  R/W
    oraDELTA  dev2(L)       (CL1-A-1, 0, 1) 811111 2222. P-VOL 
    PSUS   ASYNC ,0   6666     -  0    0    -   -   -       -       -/-
    oraDELTA  dev2(R)       (CL1-A-1, 0, 1) 844444 6666. S-VOL 
    SSUS   ASYNC ,0   2222     -  0    0    -   -   -       -       -/-
  5. Confirm that the mirror status of the journal of the UR delta resync pair is PJNS.

    Command example:

    pairdisplay -g oraDELTA -v jnl -IH0
    JID  MU  CTG  JNLS  AP  U(%)  Q-Marker  Q-CNT  D-SZ(BLK)  Seq#   Num  LDEV#
    000  1   1    PJNS  4   21    43216fde  30     512345     62500  1    39321 
  6. Confirm that no failure SIMs are displayed.