Hitachi 1000 - Manual (Page 26)

26 BladeSymphony 1000 Architecture White Paper www.hitachi.com
Chapter 5
I/O Sub System
I/O Modules
Hitachi engineers go to great lengths to design systems that provide high I/O throughput.
BladeSymphony 1000 PCI I/O Modules deliver up to 160 Gb/sec. throughput by providing a total of up
to 16 PCI slots (8 slots per I/O module). I/O modules accommodates industry standard PCIe or PCI-X
cards, supporting current and future technologies as well as helping to preserve investments in existing
PCI cards. In addition, by separating I/O from the server blades, the BladeSymphony 1000 overcomes
the space contraint issues of other blade server designs, which can only support smaller PCI cards.
Three I/O modules are available: PCI-X I/O Module, PCIe I/O Module, and an Embedded Fibre Channel
Switch Module. Two I/O modules are supported per chassis.
PCI-X I/O Module
The PCI-X I/O Module supports eight PCI-X cards in total, with a maximum of two PCI-X cards
assigned to a single server blade for Chassis A and four for Chassis B. In Chassis A, eight PCI cards
can be attached to four server blades, at a two-to-one ratio. In Chassis B, four PCI cards can be
attached to four server blades for a four to one ratio. Hot plug is supported in specific conditions.
See the BladeSymphony 1000 Users Manual for more information. The block diagram for the PCI-X I/O
Module is shown in Figure 16.
Figure 16. PCI-X I/O Module block diagram
PCI Express x4 link
PCI-X (133 MHz)
8 slot
(Hot Plug Support)
Error LED
A1 B1 C1 D1
I2C
Reg.
Card
Status
A2 B2 C2 D2
SW SW
SCSI
Bus connection
Legacy
Interrupt
SW SW SW SW SW SW
Legacy
Interrupt
FRU
I2C SW
Bridge Bridge Bridge Bridge