The ability to perform a GAD pair operations depends on the GAD pair status and the HTI pair status.
The following tables show
GAD operations and whether they can be performed (Yes, No) with the listed
HTI status. The information assumes the required
GAD status for the operation.
Table. GAD operations and HTI pair status, when the GAD P-VOL is shared
| TI pair status |
GAD pair operations |
| Create GAD Pairs |
Suspend Pairs |
Delete Pairs |
Resync Pairs
|
| P-VOL specified |
S-VOL specified |
P-VOL specified1 |
S-VOL specified2 |
Forced deletion |
P-VOL specified
|
S-VOL specified
|
| 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 |
| PSUS |
Yes |
Yes |
Yes |
Yes |
No3 |
Yes |
Yes |
Yes |
| COPY(RS-R) |
No4 |
Not possible |
Not possible |
Yes |
No3 |
Yes |
No4 |
No4 |
| PSUE |
Yes |
Yes |
Yes |
Yes |
No3 |
Yes |
Yes |
Yes |
|
Notes:
- 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.
- 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.
- 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 HTI P-VOL.
- To continue resynchronizing the HTI pair, you must split the GAD pair.
|
Table. GAD operations and HTI pair status, when the GAD S-VOL is shared
| TI pair status |
GAD pair operations |
| Create GAD Pairs |
Suspend Pairs |
Delete Pairs |
Resync Pairs
|
| P-VOL specified |
S-VOL specified |
P-VOL specified1 |
S-VOL specified2 |
Forced deletion |
P-VOL specified
|
S-VOL specified
|
| 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 |
| PSUS |
No3 |
Yes |
Yes |
No4 |
Yes |
Yes |
Yes |
Yes |
| COPY(RS-R) |
No3, 5 |
No |
No |
No4 |
Yes |
Yes |
No5, 6 |
No6 |
| PSUE |
No3 |
Yes |
Yes |
No4
|
Yes |
Yes |
Yes |
Yes |
|
Notes:
- You can delete a GAD pair by specifying the primary volume, only when the I/O mode is Local and the GAD pair status of the primary volume is PSUS or PSUE.
- You can delete a GAD pair by specifying the secondary volume, only when the I/O mode is Local and the GAD pair status of the secondary volume is SSWS.
- To create a GAD pair, you must assign the GAD reserve attribute to the volume used as an S-VOL. Because the virtual LDEV ID of the volume to which the GAD reserve attribute is assigned is deleted, you cannot create a GAD pair by specifying the volume shared with HTI as the S-VOL of the pair.
- Cannot be used because, when you delete a GAD PAIR specifying the P-VOL, the S-VOL's virtual LDEV ID is also deleted, which makes it unusable as an HTI P-VOL.
- Cannot be used because the GAD pair's target volume is the same as the HTI pair's target volume.
- To continue resynchronizing the HTI pair, you must split the GAD pair.
|