The procedure for recovering from a system down failure of the storage system at the source primary site deletes all pairs in the target site and the UR pair in the source site.
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If a delta resync is performed at a temporary failure in the source GAD primary site,
recover from the failure, and then turn on the power of the storage system at
the source GAD
primary site.
The pair status for the P-VOL and S-VOL of the different pairs will be as follows:
- For the source GAD pair: PSUE for the P-VOL and SSWS for the S-VOL
- For the UR delta resync pair: PSUE for the P-VOL and SSUS for the S-VOL
- For the source UR pair: PAIR for both the P-VOL and S-VOL
- For the temporary GAD pair for migration: PSUE for the P-VOL and COPY for the S-VOL
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Delete the target UR pair.
Command example:
pairsplit -g UR10 -S -IH11
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Delete the target UR delta resync pair.
Command example:
pairsplit -g UR11 -S -IH12
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Suspend the target GAD pair.
Command example:
pairsplit -g HA10 -IH11
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Delete the target GAD pair.
Command example:
pairsplit -g HA10 -S -IH11
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Forcibly delete the temporary GAD pair used for migration.
Command example:
pairsplit -g HA20 -RF -IH11 pairsplit -g HA20 -SFV -IH01
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From the source GAD secondary site, swap resynchronize the source GAD pair.
Command example:
pairresync -g HA00 -swaps -IH02
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Verify that the pair status of the source GAD pair becomes
PAIR.
If you continue issuing host I/Os to the source GAD secondary site after the pair status becomes PAIR, the pair status of the UR delta resync pair between the source GAD primary site and the source UR secondary site changes to PSUS.
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Resume host I/Os to the source GAD primary site.
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Stop host I/Os to the source GAD secondary site.
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From the source GAD primary site, swap suspend the source GAD pair.
Command example:
pairsplit -g HA00 -RS -IH01
Delta resync is performed in the storage systems, the UR delta resync pair between the source GAD primary site and the source UR secondary site changes to the normal UR pair, and the normal UR pair between the source GAD secondary site and the source UR secondary site changes to the UR delta resync pair.
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From the source GAD primary site, swap resynchronize the source GAD pair.
Command example:
pairresync -g HA20 -swaps -IH01
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Verify that the pair status of the source GAD pair becomes
PAIR.
If you continue issuing host I/Os after the pair status becomes PAIR, the pair status of the source UR delta resyc pair changes to PSUS.
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Resume host I/Os to the source GAD secondary site.