Chapter 4. Central processor complex I/O system structure 141
Concurrent I/O upgrade
– You can concurrently add I/O features to z13s servers if unused I/O slot positions are
available.
Concurrent PCIe I/O drawer upgrade
– Extra PCIe I/O drawers can be installed concurrently if free frame slots for PCIe I/O
drawers are available.
Dynamic I/O configuration
– Dynamic I/O configuration supports the dynamic addition, removal, or modification of
the channel path, control units, and I/O devices without a planned outage.
Pluggable optics
– The FICON Express16S, FICON Express8S and FICON Express8, OSA Express5S,
and 10GbE RoCE Express features have Small Form-Factor Pluggable (SFP) optics.
These optics allow each channel to be individually serviced during a fiber optic module
failure. The traffic on the other channels on the same feature can continue to flow if a
channel requires servicing.
Concurrent I/O card maintenance
– Every I/O card that is plugged in an I/O drawer or PCIe I/O drawer supports concurrent
card replacement during a repair action.
4.2.2 Summary of supported I/O features
The following I/O features are supported:
Up to 128 FICON Express16S channels
Up to 128 FICON Express8S channels
Up to 32 FICON Express8 channels
Up to 96 OSA-Express5S ports
Up to 96 OSA-Express4S ports
Up to 8 ICA SR links with up to 16 coupling links at 8 GBps
Up to 8 InfiniBand fanouts with one of these options:
– Up to 16 12x InfiniBand coupling links with HCA3-O fanout
– Up to 32 1x InfiniBand coupling links with HCA3-O LR (1xIFB) fanout
In addition to I/O features, the following features are supported exclusively in the PCIe I/O
drawer:
Up to four zFlash Express features
Up to eight zEDC Express features
Up to sixteen 10GbE RoCE Express features
Coupling links: ICA SR links are independent from any IFB link count because they
occupy a different adapter slot in the CPC drawer.
The maximum number of ICA SR links on z13s servers is 16, and the maximum number of
IFB links (any combination of HCA3-O and HCA3-O LR) is 32. Therefore, the maximum
number of coupling links on a z13s server is 48.
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