Ibm 990 Manual do Utilizador Página 86

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74 IBM ^ zSeries 990 Technical Guide
3.1 Overview
The z990 I/O system design provides great flexibility, high availability and performance,
allowing:
High bandwidth
The z990 I/O system can handle up to 96 GBps, which is four times the z900 server’s
bandwidth. Individual channels can have up to 2 GBps and individual Coupling Facility links
up to 2 GBps data rates.
Wide connectivity
A z990 server can be connected to an extensive range of interfaces, using protocols such as
Fibre Channel Protocol (FCP) for Small Computer System Interface (SCSI), Gigabit Ethernet
(GbE), 1000BASE-T Ethernet, 100BASE-T Ethernet, 10BASE-T Ethernet, Token Ring along
with FICON Express, ESCON, and coupling links channels.
Cryptographic functions
The z990 I/O system also supports optional cryptographic cards to complement the standard
CP Assist for Cryptographic Function (CPACF) that is implemented in every PU, enhancing
the performance of cryptographic processing.
Concurrent I/O upgrades
It is possible to concurrently add I/O cards to a z990 server provided there are unused slot
positions in an I/O cage. Additional I/O cages can be previously installed on an initial
configuration, via CUoD, to provide greater capacity for concurrent upgrades. This capability
may help eliminate an outage to upgrade the I/O configuration. See more information about
concurrent upgrades on Chapter 8, “Capacity upgrades” on page 187.
Dynamic I/O configuration
Dynamic I/O configuration enhances system availability by supporting the dynamic addition,
removal, or modification of channel paths, control units, I/O devices, and I/O configuration
definitions to both hardware and software (if it has this support) without requiring a planned
outage.
ESCON port sparing and upgrading
The ESCON 16-port I/O card includes one unused port dedicated for sparing in the event of a
port failure on that card. Other unused ports are available for growth of ESCON channels
without requiring new hardware, enabling concurrent upgrades via Licensed Internal Code
(LIC).
The following I/O feature
ports are supported in the zSeries 990 server:
򐂰 Up to 1024 ESCON (up to 720 ESCON on model A08)
򐂰 Up to 120 Fibre Connection (FICON) Express (up to 96 FICON on model A08)
򐂰 Up to 48 Open Systems Adapter (OSA) Express
򐂰 Up to 16 Integrated Cluster Bus-4 (ICB-4) (up to 12 ICB-4 on model A08)
򐂰 Up to 16 Integrated Cluster Bus-3 (ICB-3)
򐂰 Up to eight Integrated Cluster Bus-2 (ICB-2)
򐂰 Up to 48 Inter-System Channel-3 (ISC-3) in peer mode (up to 32 ISC-3 in compatibility
mode)
򐂰 Up to two External Time Reference (ETR)
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