This topic discusses pairs that are split by user operation (PSUS), and pairs that are suspended by the system because of failure (PSUE). You can split a pair when the initial copy operation is complete.
Use the pairdisplay command to display split types in hexadecimal format. When you run the pairdisplay command with the -fe option, the type of PSUE appears in the ST column in hexadecimal format. The following table describes the split types.
|
Code |
Split type |
Volume applies to |
Description |
|---|---|---|---|
|
0x03 |
Primary Volume by Operator |
P-VOL |
The user split the pair from the primary system by disabling the write with the pairsplit command. The S-VOL split type is by MCU. |
|
0x04 |
Secondary Volume by Operator |
P-VOL S-VOL |
The user split the pair from the primary or secondary system using the pairsplit command. |
|
0x05 |
by MCU |
S-VOL |
The secondary system received a request from the primary system to split the pair. The P-VOL split type is Primary Volume by Operator or Secondary Volume by Operator. |
|
0x07 |
Delete pair to RCU |
P-VOL |
The primary system detected that the S-VOL status changed to SMPL because you released the pair from the secondary system. The pair cannot be resynchronized because the S-VOL does not have the PSUE/PSUS status. |
|
0x06 |
by RCU |
P-VOL |
The primary system detected an error condition at the secondary system (RCU), that caused the primary system to split the pair. The S-VOL split type is Secondary Volume Failure. |
|
0x08 |
Secondary Volume Failure |
P-VOL S-VOL |
The primary system detected an error during communication with the secondary system, or an I/O error during update copy. In this case, the S-VOL split type is usually Secondary Volume Failure. This split type is also used when the number of paths falls below the minimum number of paths specified using the raidcom modify rcu command. |
|
0x09 |
MCU IMPL |
P-VOL S-VOL |
The primary system could not find valid control information in its nonvolatile memory during IMPL. This condition occurs only if the primary system is without power for more than 48 hours (that is, power failure and fully discharged backup batteries). |
|
0x50 |
Initial Copy Failed |
P-VOL S-VOL |
The pair was split from the primary system before the initial copy operation was complete. The data on the S-VOL is not identical to the data on the P-VOL. |