If you share GAD volumes with Thin Image volumes, stop I/O to a volume before storing snapshot data. Snapshot consistency cannot be guaranteed if you store snapshot data without stopping I/O to the volume.Sharing Thin Image volumes with global-active device
You can use a Thin Image (HTI) P-VOL as a global-active device (GAD) P-VOL or S-VOL.
The following tables list the relationship between Thin Image tasks and GAD pair status.
If you share GAD volumes with Thin Image volumes, stop I/O to a volume before storing snapshot data. Snapshot consistency cannot be guaranteed if you store snapshot data without stopping I/O to the volume.
For more information about GAD, see the Virtual Storage Platform G1000 Global-Active Device User Guide.
The following table lists the Thin Image tasks you can perform when the P-VOL is shared with a GAD P-VOL.
|
GAD status |
I/O mode |
HTI task |
||||
|---|---|---|---|---|---|---|
|
Create pair |
Store snapshot data |
Restore pair |
Delete snapshot data |
Delete pair |
||
|
COPY |
Mirror (RL) |
Yes |
Yes |
No |
Yes |
Yes |
|
PAIR |
Mirror (RL) |
Yes |
Yes |
No |
Yes |
Yes |
|
PSUS |
Local |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Block |
Yes |
Yes |
No |
Yes |
Yes |
|
|
PSUE |
Local |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Block |
Yes |
Yes |
No |
Yes |
Yes |
|
|
Legend:
|
||||||
The following table lists the Thin Image tasks you can perform when the P-VOL is shared with a GAD S-VOL.
|
GAD status |
I/O mode |
HTI task |
||||
|---|---|---|---|---|---|---|
|
Create pair |
Store snapshot data |
Restore pair |
Delete snapshot data |
Delete pair |
||
|
COPY |
Block |
No |
No |
No |
No |
Yes |
|
PAIR |
Mirror (RL) |
Yes |
Yes |
No |
Yes |
Yes |
|
SSUS |
Block |
Yes |
Yes |
No |
Yes |
Yes |
|
PSUE |
Block |
Yes |
Yes |
No |
Yes |
Yes |
|
SSWS |
Local |
Yes |
Yes |
No |
Yes |
Yes |
|
Legend:
|
||||||