When a failure (LDEV blockade) occurs on an S-VOL at the secondary site, the GAD pair statuses of the P-VOL and S-VOL change to PSUE.
Overview of failure recovery
- Remove the failure (LDEV blockade) on the S-VOL.
- If the S-VOL must be formatted for restoration, delete the GAD pair, and then format the S-VOL.
-
Depending on if you performed step 2, re-create the
GAD pair, the delta resync
UR pair, and the
UR pair in that order, or resynchronize the
GAD pair in the primary storage system.
- If you performed step 2, re-create the GAD pair, the delta resync UR pair, and the UR pair in that order.
If a failure occurs after the one volume capacity of a GAD pair or UR pair can be expanded, the creation, resync, swap resync, horctakeover, and delta resync operations of the GAD pair or UR 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.
Command example:
paircreate -g oraHA -fg never 2 -vl -jq 0 -IH0 paircreate -g oraDELTA -f async -vl -jp 0 -js 0 -nocsus -IH1 paircreate -g oraREMOTE -f async -vl -jp 0 -js 0 -IH0
- If you did not perform step 2, resynchronize the GAD pair in the primary storage system.
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.
Command example:
pairresync -g oraHA -IH0
- If you performed step 2, re-create the GAD pair, the delta resync UR pair, and the UR pair in that order.
-
Confirm that the
GAD P-VOL and S-VOL pair statuses change to PAIR.
Command example:
pairdisplay -g oraHA -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 oraHA dev1(L) (CL1-A-0, 0, 0)811111 2222.P-VOL PAIR NEVER , 100 4444 - - 0 - - - - L/M oraHA dev1(R) (CL1-C-0, 0, 0)822222 4444.S-VOL PAIR NEVER , 100 2222 - - 0 - - - - L/M
pairdisplay -g oraHA -fxce -IH1 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 oraHA dev1(L) (CL1-C-0, 0, 0)822222 4444.S-VOL PAIR NEVER , 100 2222 - - 0 - - - - L/M oraHA dev1(R) (CL1-A-0, 0, 0)811111 2222.P-VOL PAIR NEVER , 100 4444 - - 0 - - - - L/M
- Keep updating I/O from the server to the P-VOL or S-VOL of the GAD pair for about two minutes.
- Confirm that the status of the UR delta resync P-VOL is PSUS.
Command example:
pairdisplay -g oraDELTA -fxce -IH1 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 dev3(L) (CL1-A-1, 0, 1) 822222 4444. P-VOL PSUS ASYNC ,0 6666 - 0 0 - - - - -/- oraDELTA dev3(R) (CL1-A-1, 0, 1) 844444 6666. S-VOL SSUS ASYNC ,0 4444 - 0 0 - - - - -/-
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Confirm that the mirror status of the journal of the
UR delta resync pair is PJNS using the
CCI instance for managing the
GAD secondary storage system.
Command example:
pairdisplay -g oraDELTA -v jnl -IH1 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
- Confirm that no failure SIMs are displayed.