GAD operations and SI pair status

Ops Center High Availability User Guide
Version
10.9.x
File Size
3.9 MB
Audience
anonymous
Part Number
MK-99ADM003-14

The ability to perform a GAD pair operation depends on GAD pair status and SI pair status.

The following tables show GAD operations and whether they can be performed (Yes, No) with the listed SI status. The information assumes the required GAD status for the operation.

Table. GAD operations and SI pair statuses, when GAD P-VOL is shared

SI pair status

GAD pair operations

Create pairs

Suspend pairs

Delete pairs

Resync pairs

P-VOL selected

S-VOL selected

P-VOL selected1

S-VOL selected2

Forced deletion

P-VOL selected

S-VOL selected

SMPL(PD)

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

COPY

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

PAIR

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

COPY(SP)

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

PSUS(SP)

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

PSUS

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

COPY(RS)

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

COPY(RS-R)

No4

impossible

impossible

Yes

No3

Yes

No4

No4

PSUE

Yes

Yes

Yes

Yes

No3

Yes

Yes

Yes

Notes:

  1. You can delete a GAD pair by specifying the P-VOL, only when the I/O mode is Local and the GAD pair status of the P-VOL is PSUS or PSUE.
  2. You can delete a GAD pair by specifying the S-VOL, only when the I/O mode is Local and the GAD pair status of the S-VOL is SSWS.
  3. Cannot be used because, when you delete a GAD pair specifying the S-VOL, the P-VOL's virtual LDEV ID is also deleted, which makes it unusable as the SI P-VOL.
  4. To continue SI restore copy, the GAD pairs must be suspended.
Table. GAD operations and SI pair statuses, when GAD S-VOL is shared

SI pair status

GAD pair operations

Create pairs

Suspend pairs

Delete pairs

Resync pairs

P-VOL selected

S-VOL selected

P-VOL selected1

S-VOL selected2

Forced deletion

P-VOL selected

S-VOL selected

SMPL(PD)

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

COPY

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

PAIR

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

COPY(SP)

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

PSUS(SP)

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

PSUS

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

COPY(RS)

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

COPY(RS-R)

No3, 5

impossible

impossible

No4

Yes

Yes

No5, 6

No6

PSUE

No3

Yes

Yes

No4

Yes

Yes

Yes

Yes

Notes:

  1. You can delete a GAD pair by specifying the P-VOL, only when the I/O mode is Local and the GAD pair status of the P-VOL is PSUS or PSUE.
  2. You can delete a GAD pair by specifying the S-VOL, only when the I/O mode is Local and the GAD pair status of the S-VOL is SSWS.
  3. When a GAD pair is created, the GAD reserve attribute is assigned to the volume that will become the S-VOL, which removes the virtual LDEV ID of this volume, making it unusable as an SI pair volume.

    The GAD reserve attribute is set, and the virtual LDEV ID is deleted for the volume that will become the GAD S-VOL, making it unusable as an SI volume.

  4. Cannot be used because, when you delete a GAD pair specifying the S-VOL, the P-VOL's virtual LDEV ID is also deleted, which makes it unusable as the SI P-VOL.
  5. Cannot be used because the volume at the GAD copy destination is the same as the volume at the ShadowImage copy destination.
  6. To continue ShadowImage restore copy, GAD pairs must be suspended.