Pair status for TrueCopy pairs
The following explains the operations and status transitions for TrueCopy pairs.
|
Pair status |
Description |
Access to the P-VOL |
Access to the S-VOL |
|---|---|---|---|
|
SMPL |
Unpaired volumes |
-- |
-- |
|
COPY |
A pair is being created. An initial copy or resynchronization is being performed. |
R/W enabled |
R enabled |
|
PAIR |
Paired volumes The initial copy finished, and the pair volumes are synchronized. |
R/W enabled |
R enabled |
|
PSUS |
The pair is split by operation, or deleted from the storage system on the secondary site. (This value is output for the P-VOL.) |
R/W enabled |
R/W enabled #1 |
|
SSUS |
The pair is split by operation, or deleted from the storage system on the secondary site. (This value is output for the S-VOL.) |
R/W enabled |
R/W enabled #1 |
|
PSUE |
The pair is split due to a failure. |
R/W enabled #2 |
R enabled |
|
SSWS |
The P-VOL and S-VOL are switched, and the S-VOL is writable. |
R enabled |
R/W enabled |
#1: When you split a pair, you can specify whether to permit read-write or read-only.
#2: When the fence level of the P-VOL is DATA (S-VOL data), read-only is permitted.
If you delete a pair, the pair status changes to SMPL.
Pair status for Universal Replicator pairs
The following explains the operations and status transitions for Universal Replicator pairs.
Universal Replicator pairs have specific pair statuses because Universal Replicator pairs use the journal volume to asynchronously copy data.
|
Pair status |
Description |
Access to the P-VOL |
Access to the S-VOL |
|---|---|---|---|
|
SMPL |
Unpaired volumes |
-- | -- |
|
COPY |
A pair is being created. An initial copy or resynchronization is being performed. |
R/W enabled |
R enabled |
|
PAIR |
Paired volumes The initial copy is finished, and the pair volumes are synchronized. |
R/W enabled |
R enabled |
|
PSUS |
The pair is split by operation, or deleted from the storage system on the secondary site. (This value is output for the P-VOL.) |
R/W enabled |
R/W enabled # |
|
SSUS |
The pair is split by operation, or deleted from the storage system on the secondary site. (This value is output for the S-VOL.) |
R/W enabled |
R/W enabled # |
|
PSUE |
The pair is split due to a failure. |
R/W enabled |
R enabled |
|
SSWS |
The P-VOL and S-VOL are switched, and the S-VOL is writable. |
R enabled |
R/W enabled |
| PFUL |
The amount of the data in the journal volume exceeds the threshold (80%). The pair is not split, and data continues to be copied. |
R/W enabled |
R enabled |
| PFUS |
The amount of the data in the journal volume reaches 100%, and the pair is split. You must review the configurations of remote paths and the journal volume. |
R/W enabled |
R enabled # |
#: This is determined by the secondary volume's access mode that is specified to split the pair. (Default: Read is enabled.)
If you delete a pair, the pair status changes to SMPL.
In the following cases, if you perform an operation on a pair, the request successfully returns a response, but the details specified in the request body are not actually applied:
- When you perform a pair splitting operation on a pair for which the status is PSUS or SSUS
- When you perform a pair resynchronization operation on a pair for which the status is COPY or PAIR