Failure in the remote path from the secondary to the primary storage system of the source GAD pair

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

If there are no I/Os issued to the failure location, the GAD pair might not be suspended and remain in the same status as before the failure. The following procedures assume that there are I/Os issued to the failure location.

The following table lists the pair status (in the upper row) and I/O mode (in the lower row) in phases 1 to 6 of a failure occurrence during data migration.

Phase of failure occurrence	Volume	Source GAD pair		Temporary GAD pair created for migration		Target GAD pair
Phase of failure occurrence	Volume	Before the failure	After the failure	Before the failure	After the failure	Before the failure	After the failure
1. Creating a temporary GAD pair	P-VOL	PAIR Mirror(RL)	PSUE¹ Block	COPY Mirror(RL)	No change
1. Creating a temporary GAD pair	S-VOL	PAIR Mirror(RL)	SSWS² Local	COPY Block	No change
2. Creating a target GAD pair	P-VOL	PAIR Mirror(RL)	PSUE¹ Block	COPY Mirror(RL)	No change	COPY Mirror(RL)	No change
2. Creating a target GAD pair	S-VOL	PAIR Mirror(RL)	SSWS² Local	COPY Block	No change	COPY Block	No change
3. Suspending the source GAD pair (at the P-VOL)	P-VOL	PSUS Local	No change	COPY Mirror(RL)	No change³	COPY Mirror(RL)	No change
3. Suspending the source GAD pair (at the P-VOL)	S-VOL	SSUS Block	No change	COPY Block	No change³	COPY Block	No change
4. The temporary GAD pair is migrated to PAIR	P-VOL	PSUS Local	No change	PAIR Mirror(RL)	No change	COPY Mirror(RL)	No change
4. The temporary GAD pair is migrated to PAIR	S-VOL	SSUS Block	No change	PAIR Mirror(RL)	No change	COPY Block	No change
5. Suspending the temporary GAD pair (at the S-VOL)	P-VOL	PSUS Local	No change	PSUS Block	No change	COPY² Mirror(RL)	No change³
5. Suspending the temporary GAD pair (at the S-VOL)	S-VOL	SSUS Block	No change	SSWS Local	No change	COPY² Block	No change³
6. The target GAD pair is migrated to PAIR	P-VOL	PSUS Local	No change	PSUS Block	No change	PAIR Mirror(RL)	No change
6. The target GAD pair is migrated to PAIR	S-VOL	SSUS Block	No change	SSWS Local	No change	PAIR Mirror(RL)	No change
Notes: The pair status and the I/O mode might be PSUE(Local). The pair status and the I/O mode might be PSUE(Block). The pair status and the I/O mode might be PAIR(Mirror(RL)) depending on the progress of the copy operation.

The following procedures are the examples of the recovery procedures to continue data migration.