The following table shows the cache modes of nondisruptive migration and GAD pair operations.
|
Operation target |
Virtual LDEV ID |
GAD pair operation |
|
|---|---|---|---|
|
P-VOL |
S-VOL |
||
|
Cache modes for external volume groups of the destination storage system |
TM (Cache Through) |
N |
N |
|
SM (Write Sync) |
Y |
N |
|
|
Legend Y: Can be performed N: Cannot be performed |
|||
The following table shows the possibility of GAD pair operation and cache mode change in nondisruptive migration.
|
Operation target |
Cache modes to which GAD P-VOL can be changed |
||
|---|---|---|---|
|
TM (Cache Through) |
SM |
EM/DM |
|
|
GAD P-VOL |
N |
Y |
N |
|
Legend Y: Can be performed N: Cannot be performed |
|||
The following table shows the possibility of Volume Migration pair operations (when a GAD pair operating with nondisruptive migration is in the initial status).
|
GAD pair status |
Virtual LDEV ID |
I/O from the server |
Volume Migration operation |
||
|---|---|---|---|---|---|
|
Read |
Write |
Migrate volumes |
Stop migrating volumes |
||
|
SMPL |
Specifed |
Y |
Y |
Y |
Y |
|
None |
N |
N |
N |
Y |
|
|
None (GAD reserve is specified as the virtual attribute) |
N |
N |
N |
Y |
|
|
Legend Y: Can be performed N: Cannot be performed |
|||||
The following table shows the possibility of Volume Migration pair operations (when a GAD pair operating with nondisruptive migration is being mirrored).
|
GAD pair status |
I/O mode |
Pair location |
I/O from the server |
Volume Migration operation |
||
|---|---|---|---|---|---|---|
|
Read |
Write |
Migrate volumes |
Stop migrating volumes |
|||
|
INIT/COPY |
Mirror (RL) |
P-VOL |
Y |
Y |
N |
Y |
|
Block |
S-VOL |
N |
N |
N |
Y |
|
|
Legend Y: Can be performed N: Cannot be performed |
||||||
The following table shows the possibility of Volume Migration pair operations (when a GAD pair operating with nondisruptive migration is already mirrored).
|
GAD pair status |
I/O mode |
Pair location |
I/O from the server |
Volume Migration operation |
||
|---|---|---|---|---|---|---|
|
Read |
Write |
Migrate volumes |
Stop migrating volumes |
|||
|
PAIR |
Mirror (RL) |
P-VOL |
Y |
Y |
Y |
Y |
|
Block |
S-VOL |
N |
N |
N |
Y |
|
|
Legend Y: Can be performed N: Cannot be performed |
||||||
The following table shows the possibility of Volume Migration pair operations (when a GAD pair operating with nondisruptive migration is suspended).
|
GAD pair status |
I/O mode |
Pair location |
I/O from the server |
Volume Migration operation |
||
|---|---|---|---|---|---|---|
|
Read |
Write |
Migrate volumes |
Stop migrating volumes |
|||
|
PSUS/PSUE |
Local |
P-VOL |
Y |
Y |
Y |
Y |
|
Block |
Volume of your own choice (P-VOL or S-VOL) |
N |
N |
Y |
Y |
|
|
SSUS |
Block |
S-VOL |
N |
N |
Y |
Y |
|
SSWS |
Local |
S-VOL |
Y |
Y |
Y |
Y |
|
Legend Y: Can be performed N: Cannot be performed |
||||||
The following table shows the possibility of Volume Migration pair operations (when a GAD pair operating with nondisruptive migration is blocked).
|
GAD pair status |
I/O mode |
Pair location |
I/O from the server |
Volume Migration operation |
||
|---|---|---|---|---|---|---|
|
Read |
Write |
Migrate volumes |
Stop migrating volumes |
|||
|
PSUE |
Block |
P-VOL |
N |
N |
Y |
Y |
|
S-VOL |
N |
N |
Y |
Y |
||
|
Legend Y: Can be performed N: Cannot be performed |
||||||
The following table shows the GAD pair status in Volume Migration when GAD and nondisruptive migration are used together, and the possibility of Volume Migration pair operations (when the GAD P-VOL is a target volume of Volume Migration).
|
Volume Migration pair status |
Is VM P-VOL shared with NDM? |
Is VM S-VOL shared with NDM? |
GAD pair operation |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Create |
Suspend |
Delete |
Resynchronize |
||||||||
|
P-VOL specified |
S-VOL specified |
P-VOL specified 1 |
S-VOL specified 2 |
Force delete |
P-VOL specified 3 |
S-VOL specified |
|||||
|
SMPL (PD) |
Yes |
No4 |
Y |
Y |
Y |
Y |
N |
Y |
N |
N |
|
|
COPY |
Yes |
No4 |
N |
Y |
Y |
Y |
N |
Y |
N |
N |
|
|
PSUE |
Yes |
No4 |
N |
Y |
Y |
Y |
N |
Y |
N |
N |
|
|
PSUS |
No4 |
Yes |
N |
Y |
Y |
Y |
N |
Y |
N |
N |
|
|
Legend VM: Volume Migration NDM: nondisruptive migration Y: Can be performed N: Cannot be performed Note:
|
|||||||||||