TrueCopy for Mainframe on VSP One Block 85 uses FICON® channel interfaces and IBM® I-2107 CU emulation for compatibility with GDPS, z/OS®, and PPRC‑based replication workflows.
The following table shows GDPS and TrueCopy for Mainframe features supported by IBM® I-2107 and VSP One Block 85.
Note: The information shown below might not be current. For the latest GDPS TCz information, contact customer support.
| Feature | IBM® I-2107 | VSP One B85 |
|---|---|---|
| Planned outage | Supported | Supported |
| Unplanned outage using IEA494I | Supported | Supported |
| IEA494I Long Busy message | Default FREEZE time = 120 sec | Default FREEZE time = 120 sec; range 0–518,400 sec |
| PPRC / TCz | PPRC | TrueCopy for Mainframe |
| Hardware-based replication | 2107 to 2107 | Supported between VSP One B85 and other supported Hitachi mainframe arrays |
| Interface between storage systems | Fibre Channel (via FICON® host interfaces) | Fibre Channel using switch/extender |
| Copy modes supported | Synchronous | Synchronous |
| Dual Copy combination support | Supported | Not supported |
| TSO command support | Supported | Supported (some options only via CCI) |
| ICKDSF command support | Supported | Supported (some options only via CCI) |
| P/DAS support | Supported | Supported |
| Maximum pairs | 65,280 | 65,280 |
| Maximum paths between storage systems | 4 | 8 per logical control unit |
| Number of copy operations on initial copy | 4 | Default 4 per CU; adjustable 1–16 via CCI |
| Dedicated interface between storage systems | No | Requires port set to target mode (via CCI or automatically) |
| PACE parameter initial copy option | 1–255 (default 15) | 3 or 15 (default 15) |
| CRITICAL pair error options (Fence Level) | Yes / No – Default | S-VOL Data Never – Default S-VOL Status |
| CGROUP | FREEZE/RUN by logical controller SSID pair | FREEZE/RUN by logical controller SSID pair |
| CQUERY | Supported | Supported |
| Minimum paths | Not supported | Default = 1; if below, all pairs split based on Fence Level |
| PPRC support by host | Host must support PPRC | Default YES; optional support for non‑PPRC OS |
| Secondary system to primary system SIM reporting | Not supported | To any host or only to secondary system host |
| Secondary system to primary system service SIM reporting | Not supported | Default = Not report (for non‑MVS OS) |
| CFW Data | Not supported | Optional to S‑VOL; default = Primary Volume Only |
| Max volumes | 256 per storage system | 256 per CU |
| SIM/error messages | Per IBM® document | Per IBM® document |
| Local storage system interface | FICON® | FICON® |
| Remote storage system interface | FICON® | FICON® |
| Channel extender support | Yes | Contact customer support |