Unix:HP StorageWorks Continuous Access
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Volume pairs
As described above, original data is stored in the P-VOL and the remote copy is stored in the S-VOL. The pair can be split, resynchronized, reverse resynchronized, and returned to the SMPL state.
- When paired, the volumes are synchronized.
- When split, new data is sent to the P-VOL but not the S-VOL.
- When re-synchronized, changed data is copied to the S-VOL.
- When necessary, data in the S-VOL can be copied to the P-VOL.
During normal operations, the P-VOL remains available to the host for read and write I/O operations. The secondary system rejects write I/Os for the S-VOL, unless the write-enable option is specified for P9000 Continuous Access Synchronous User Guide 13 the S-VOL. Then, write I/O is allowed to the S-VOL while the pair is split. In this instance, S-VOL and P-VOL track maps keep track of differential data and are used to re-synchronize the pair. Logical units on the local and remote systems must be defined and formatted prior to pairing.
- MCA Main Control Unit
- RCA Remote Control Unit
- SVP Service Processor
- P-VOL Primary Volume
- S-Vol Secondary Volume