IBM z13s Technical Manual page 34

For I/O constraint relief, the IBM z13s server has improved scalability with support for three
logical channel subsystems (LCSSs), three subchannel sets (to support more devices per
logical channel subsystem), and up to 32K devices per IBM FICON® channel up from 24K
channels in the previous generation.
For improved device connectivity for parallel access volumes (PAVs), Peer-to-Peer Remote
Copy (PPRC) secondary devices, and IBM FlashCopy® devices, the third subchannel set
allows extending the amount of addressable external storage. In addition to performing an IPL
from subchannel set 0, z13s servers allow you to also perform an IPL from subchannel set 1
(SS1), or subchannel set 2 (SS2).
The system I/O buses take advantage of the PCIe technology and the InfiniBand technology,
which are also used in coupling links.
z13s connectivity supports the following I/O or special purpose features:
Storage connectivity:
– Fibre Channel connection (FICON):
• FICON Express16S 10 KM long wavelength (LX) and short wavelength (SX)
• FICON Express8S 10 KM long wavelength (LX) and short wavelength (SX)
• FICON Express8 10 KM LX and SX (carry forward only)
Networking connectivity:
– Open Systems Adapter (OSA):
• OSA-Express5S 10 GbE LR and SR
• OSA-Express5S GbE LX and SX
• OSA-Express5S 1000BASE-T Ethernet
• OSA-Express4S 10 GbE LR and SR (carry forward only)
• OSA-Express4S GbE LX and SX (carry forward only)
• OSA-Express4S 1000BASE-T Ethernet (carry forward only)
– IBM HiperSockets™
– Shared Memory Communications - Direct Memory Access (SMC-D) over Internal
Shared Memory (ISM)
– 10 GbE Remote Direct Memory Access (RDMA) over Converged Ethernet (RoCE)
using Shared Memory Communications over RDMA (SMC-R)
Coupling and Server Time Protocol (STP) connectivity:
– Integrated Coupling Adapter (ICA SR)
– Parallel Sysplex InfiniBand coupling links (IFB)
– Internal Coupling links (IC)
In addition, z13s servers support the following special function features, which are installed
on the PCIe I/O drawers:
Crypto Express5S
Flash Express
zEnterprise Data Compression (zEDC) Express
Flash Express
Flash Express
has been enhanced with more cache memory to benefit availability during memory dump
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IBM z13s Technical Guide
is an innovative optional feature that was first introduced with the zEC12 and