Pair condition and recovery: other failures

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

Generally, you can correct failures by recovering the paths and resynchronizing the pair. The following table shows transitions for pair status and I/O mode, the volumes that are accessible from the server, and the location of the latest data when a failure other than explained above occurs.

Before failure

After failure

Pair status and I/O mode

Pair status and I/O mode

Volume accessible from the server

Volume with latest data

P-VOL

S-VOL

P-VOL

S-VOL

P-VOL

S-VOL

PAIR (Mirror (RL))1

PAIR (Mirror (RL))1

PSUE (Local)

PSUE (Block)

OK

NG

P-VOL

PSUE (Block)

SSWS (Local)

NG

OK

S-VOL

PAIR (Mirror (RL))

PAIR (Block)

OK

NG

Both P-VOL and S-VOL

PAIR (Mirror (RL))

PAIR (Block)

PSUE (Block)

SSWS (Local)

NG

OK

S-VOL

COPY (Mirror (RL))

COPY (Block)

PSUE (Local)

PSUE/COPY (Block)

OK

NG

P-VOL

NG2

NG

P-VOL

PSUS/PSUE (Local)

SSUS/PSUE (Block)

PSUS/PSUE (Local)

SSUS/PSUE (Block)

OK

NG

P-VOL

NG2

NG

P-VOL

PSUS/PSUE (Block)

SSWS (Local)

PSUS/PSUE (Block)

SSWS (Local)

NG

OK

S-VOL

NG

NG3

S-VOL

Notes:

  1. The pair status and I/O mode after failure depends on the requirement of the pair. For details, see Server I/Os and data mirroring with blocked quorum disk or without quorum disk volumes.
  2. Depending on the failure factor, if you cannot access the P-VOL, you cannot access the P-VOL or the S-VOL.
  3. Depending on the failure factor, if you cannot access the S-VOL, you cannot access the P-VOL or the S-VOL.

SIMs

  • Primary storage system: SIM varies depending on the failure type
  • Secondary storage system: SIM varies depending on the failure type
  1. Recover the system.
  2. Resynchronize the pair.
    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.