HP XP External Storage Software - Manual (Page 29)

Figure 11 Single Mode with Alternate Paths in Standby only
Connecting Mainframe Volumes
Mainframe volumes, that pre-exist on an external storage system and are accessed by ESCON or FICON
channels, cannot connect directly to the storage system as an external volume. The storage system does
not recognize these volumes because of the Fibre Channel.
To use external volumes as mainframe volumes, there are two ways:
• Zero-format external volumes on the external storage system side, map the external volumes to the
internal volumes using External Storage on the local storage system side, and then perform the
Write to Control Blocks operation using the VLL function on the local storage system side.
• Map the external volumes to the internal volumes using External Storage on the local storage
system side, and then format the mapped external volumes using the VLL function on the local
storage system side.
If you set the emulation type for the mainframe system (such as 3380 or 3390, shown in
“ Required Volume Capacity for Each Emulation Type ” on page 127) as you map the external volume,
the status of the mapped volume becomes Blockade after the mapping operation. After the system
administrator performs the Write to Control Blocks operation or formats the mapped external volumes
using VLL function on the local storage system side, the mainframe host can then access the new
mainframe volume through the local storage system’s ESCON or FICON channels.
XP24000 External Storage Software User’s Guide 29