Global-active device pair and Universal Replicator pair interoperability

Ops Center High Availability User Guide

Version
10.9.x
File Size
3.9 MB
Audience
anonymous
Part Number
MK-99ADM003-14

GAD pairs and Universal Replicator pairs work together for different pair statuses.

The following table shows GAD pair operations and whether they can be performed (Yes or No) with the listed UR pair status.

Table. GAD operations and UR pair statuses
UR pair status Attribute of the target UR pair GAD pair operation
Create pairs1 Split pairs Suspend pairs Resynchronize pairs Delete pairs
P-VOL specified S-VOL specified P-VOL specified S-VOL specified P-VOL or S-VOL specified
COPY P-VOL No Yes No Yes Yes No2
S-VOL No No3 No No No No2
PAIR P-VOL No Yes No Yes Yes No2
S-VOL No No3 No No No No2
PSUS P-VOL No Yes No Yes Yes No2
PSUE P-VOL No Yes No Yes Yes No2
S-VOL No No3 No No No No2
SSUS S-VOL No No3 No No No No2
SSWS S-VOL No No3 No No No No2
HOLD P-VOL No No Yes No No No2
S-VOL No No No No No No2
HLDE P-VOL No No Yes No No No2
S-VOL No No No No No No2
Note:
  1. When creating a GAD and UR configuration, create a GAD pair first.
  2. When deleting a GAD pair, delete the UR pair and the UR delta resync pair first.
  3. The UR S-VOL is also used as the GAD P-VOL only when the UR S-VOL is duplicated using GAD. In this case, the GAD P-VOL status must be PSUS, therefore, the pair split terminates abnormally.

The following table shows UR pair operations and whether they can be performed (Yes or No) with the listed GAD pair status.

Table. UR pair operations and GAD pair statuses
GAD pair status I/O mode Attribute of the target GAD pair UR pair operation
Create pairs Split pairs Suspend pairs Resynchronize pairs
P-VOL specified S-VOL specified P-VOL specified S-VOL specified
INIT/COPY Mirror (RL) P-VOL No Yes No Yes1 No
Block S-VOL No No No No No
COPY Mirror (RL) P-VOL No Yes No Yes1 No
Block S-VOL No No No No No
PAIR Mirror (RL) P-VOL Yes2 Yes No Yes1 No
S-VOL No No No No No
PSUS Local P-VOL No Yes Yes3 Yes1 Yes3
Block P-VOL No Yes Yes3

No

No

PSUE Local P-VOL No Yes Yes3 Yes1 Yes3
Block P-VOL No Yes Yes3 No No
SSUS Block S-VOL No

No

No

No

No

SSWS Local S-VOL No Yes No Yes No

Note:

  1. Can be done only when the UR delta resync pair status is HLDE.
  2. GAD pairs can be used with UR pairs only when the volume specified as the UR S-VOL is a UR delta resync S-VOL.
  3. The UR S-VOL is also used as the GAD P-VOL only when the UR S-VOL is duplicated using GAD.

The following table shows UR delta resync pair operations and whether they can be performed (Yes or No) with the listed GAD pair status.

Table. UR delta resync pair operations and GAD pair statuses
GAD pair status I/O mode Attribute of the target GAD pair UR delta resync pair operation
Create UR delta resync pair Delta resync Delete pairs
P-VOL specified S-VOL specified UR delta resync P-VOL UR delta resync S-VOL
INIT/COPY Mirror (RL) P-VOL No No1 Yes No No No
Block S-VOL No No1 No No No No
COPY Mirror (RL) P-VOL No No1 Yes No No No
Block S-VOL No No1 No No No No
PAIR Mirror (RL) P-VOL No No1 Yes

No

No No
S-VOL Yes No1 No No Yes4 No
PSUS Local P-VOL No No1 Yes Yes3 Yes4 No
Block P-VOL Yes2 No1 Yes Yes3 Yes4 No
PSUE Local P-VOL No No1 Yes Yes3 Yes4 No
Block P-VOL Yes2 No1 Yes Yes3 Yes4 No
SSUS Block S-VOL No No1 No No Yes4 No
SSWS Local S-VOL No No1 Yes No Yes4 No

Note:

  1. Cannot be done by users. The storage system does this automatically.
  2. If a failure occurs at the primary site, this can only be done when the volume specified as the UR delta resync S-VOL is the UR S-VOL.
  3. The UR S-VOL is also used as the GAD P-VOL only when the UR S-VOL is duplicated using GAD.
  4. Deleting a UR delta resync pair deletes the UR pair.