The following table lists the volumes that can be shared between global-active device (GAD) and ShadowImage.
|
GAD volume (CCI command) |
ShadowImage volume |
|
|---|---|---|
|
P-VOL |
S-VOL |
|
|
GAD P-VOL |
YES |
YES |
|
GAD S-VOL |
YES |
YES |
|
GAD S-VOL Reserve attribute volume |
NO |
NO |
|
GAD quorum disk volume |
NO |
NO |
The following tables list the relationship between GAD pair statuses and ShadowImage tasks when sharing GAD pair volumes and ShadowImage pair volumes.
- If a pair that cannot be split is in a consistency group (CTG), pairs in the CTG are suspended (PSUE status) when executing a CTG pair split function for ShadowImage.
- To split a ShadowImage pair that links with a GAD pair and obtain a backup, stop I/O for the target backup volume, and then split the ShadowImage pair.
ShadowImage tasks when sharing GAD P-VOL and ShadowImage P-VOL
|
ShadowImage task (CCI command) |
GAD pair status and I/O mode |
|||||
|---|---|---|---|---|---|---|
|
COPY |
PAIR |
PSUS |
PSUE |
|||
|
Mirror (RL) |
Mirror (RL) |
Local |
Block |
Local |
Block |
|
|
Create a pair (paircreate) |
YES |
YES |
YES |
YES |
YES |
YES |
|
Create and split a pair (paircreate -split) |
YES |
YES |
YES |
YES |
YES |
YES |
|
Split a pair (pairsplit) |
YES |
YES |
YES |
YES |
YES |
YES |
|
Resynchronize a pair (pairresync) |
YES |
YES |
YES |
YES |
YES |
YES |
|
Reverse Copy a pair (pairresync -restore) |
NO |
NO |
YES |
NO |
YES |
NO |
|
Quick restore a pair (pairresync -restore) |
NO |
NO |
(B20) NO (B85) YES* |
NO |
(B20) NO (B85) YES* |
NO |
|
Suspend a pair task (pairsplit -E) |
YES |
YES |
YES |
YES |
YES |
YES |
|
Delete a pair (pairsplit -S) |
YES |
YES |
YES |
YES |
YES |
YES |
| * (VSP One B85) This task cannot be performed if the migration source volume of Volume Migration is contained in the same volume. | ||||||
ShadowImage tasks when sharing GAD S-VOL and ShadowImage P-VOL
|
ShadowImage task (CCI command) |
GAD pair status and I/O mode |
||||
|---|---|---|---|---|---|
|
COPY |
PAIR |
SSUS |
PSUE |
SSWS |
|
|
Block |
Mirror (RL) |
Block |
Block |
Local |
|
|
Create a pair (paircreate) |
YES |
YES |
YES |
YES |
YES |
|
Create and split a pair (paircreate -split) |
NO |
YES |
YES |
YES |
YES |
|
Split a pair (pairsplit) |
NO |
YES |
YES |
YES |
YES |
|
Resynchronize a pair (pairresync) |
NO |
YES |
YES |
YES |
YES |
|
Reverse Copy a pair (pairresync -restore) |
NO |
NO |
NO |
NO |
YES |
|
Quick restore a pair (pairresync -restore) |
NO |
NO |
NO |
NO |
(B20) NO (B85) YES* |
|
Suspend a pair task (pairsplit -E) |
YES |
YES |
YES |
YES |
YES |
|
Delete a pair (pairsplit -S) |
YES |
YES |
YES |
YES |
YES |
| * (VSP One B85) This task cannot be performed if the migration source volume of Volume Migration is contained in the same volume. | |||||
ShadowImage tasks when sharing GAD P-VOL and ShadowImage S-VOL
|
ShadowImage task (CCI command) |
GAD pair status and I/O mode | |||||
|---|---|---|---|---|---|---|
| COPY | PAIR | PSUS | PSUE | |||
| Mirror(RL) | Mirror(RL) | Local | Block | Local | Block | |
|
Create a pair (paircreate) |
NO | NO | YES | NO | YES | NO |
| Create and split a pair (paircreate -split) | NO | NO | YES | NO | YES | NO |
|
Split a pair (pairsplit) |
NO | NO | YES | NO | YES | NO |
| Resynchronize a pair (pairresync) | NO | NO | YES | NO | YES | NO |
| Reverse Copy a pair (pairresync -restore) | NO | NO | YES | NO | YES | NO |
| Quick restore a pair (pairresync -restore) | NO | NO | NO | NO | NO | NO |
|
Suspend a pair task (pairsplit -E) |
YES | YES | YES | YES | YES | YES |
|
Delete a pair (pairsplit -S) |
YES | YES | YES | YES | YES | YES |
ShadowImage tasks when sharing GAD S-VOL and ShadowImage S-VOL
|
ShadowImage task (CCI command) |
GAD pair status and I/O mode | ||||
|---|---|---|---|---|---|
| COPY | PAIR | SSUS | PSUE | SSWS | |
| Block | Mirror(RL) | Block | Block | Local | |
|
Create a pair (paircreate) |
NO | NO | NO | NO | YES |
| Create and split a pair (paircreate -split) | NO | NO | NO | NO | YES |
|
Split a pair (pairsplit) |
NO | NO | NO | NO | YES |
| Resynchronize a pair (pairresync) | NO |
NO
|
NO | NO | YES |
| Reverse Copy a pair (pairresync -restore) | NO | NO | NO | NO | YES |
| Quick restore a pair (pairresync -restore) | NO | NO | NO | NO | NO |
|
Suspend a pair task (pairsplit -E) |
YES | YES | YES | YES | YES |
|
Delete a pair (pairsplit -S) |
YES | YES | YES | YES | YES |