This subsection describes how to recover from a failure in a storage system at the GAD secondary site. When a failure occurs at the secondary site, the GAD pair statuses at the primary site and the secondary site change to PSUE.
Overview of failure recovery
- Remove the failure on the S-VOL.
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Resynchronize the GAD pair at the primary storage system.
Command example:
pairresync -g oraHA -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. -
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.