In the following figure, an SI S-VOL also functions as a TC P-VOL. This configuration requires that the SI pair is split before the TC pair is created.
Figure. Shared
SI S-VOL with
TC P-VOL
In this configuration, before creating a TC pair, you must set the SI in the PAIR status, split the SI pair, and then set it in the PSUS status. The following table shows possibilities of TC pair operations according to the SI S-VOL status.
| TC pair operations | SI S-VOL status | |||||
|---|---|---|---|---|---|---|
|
COPY(PD)/COPY COPY(SP)/COPY COPY(RS)/COPY |
PAIR |
PSUS(SP)/PSUS |
PSUE |
PSUS |
COPY(RS-R)/RCPY |
|
| Create | No | No | No | Yes | Yes | No |
| Split P-VOL specified | No | No | No | Yes | Yes | No |
| Split S-VOL specified | No | No | No | Yes | Yes | No |
| Resync P-VOL specified | No | No | No | Yes | No* | No |
| Resync S-VOL specified | No | No | No | No | No | No |
| Delete | Yes | Yes | Yes | Yes | Yes | Yes |
| Switch operations between the primary and secondary sites (horctakeover) | No | No | No | No | No | No |
| * The TC pair cannot be resynchronized because the content of the SI S-VOL is not guaranteed. | ||||||