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Hardware architecture CentricStor - Virtual Tape Library
2.2.1.2 ICP (Integrated Channel Processor)
The ICP is the interface to the host systems connected in the overall system.
Figure 5: External and internal ICP connections
Depending on the type of host system used, it is possible to equip an ICP with a maximum
of 4 ESCON boards on the host side (connection with BS2000/OSD, z/OS or OS/390), with
one or two FICON ports (connection with z/OS or OS/390), or with one or two FC boards
(BS2000/OSD or open systems). A mixed configuration is also possible.The ICP also has
an internal FC board (or two in the case of redundancy) for connecting to the RAID disk
system.
The main task of the ICP is to emulate physical drives to the connected host systems.
The host application issues a logical mount job for a logical drive in an ICP connected to a
host system (see section “Issuing a mount job from the host” on page 39). The data trans-
ferred for the associated logical volume is then stored by the ICP directly in the RAID disk
system.
The virtual CentricStor drives support a maximum block size of 256 KB.
Communication with the other processors takes place over a LAN connection.
FC
ESCON
FC
ICP
FC
FCP
FC
ICP
Hosts
CentricStor
BS2000/OSD,
Open Systems
LAN
z/OS and OS/390
FC
FICON
FC
ICP
z/OS and OS/390
BS2000/OSD,
i