Flash Express - IBM z13s Technical Manual

10GbE RoCE Express
All native PCIe features should be ordered in pairs for redundancy. According to their physical
location in the PCIe I/O drawer, the features are assigned to one of the two resource groups
that are running on the IFP, providing management functions and virtualization functions. If
two features of same type are installed, one is always managed by resource group 1 (RG 1)
and the other feature is managed by resource group 2 (RG 2). This configuration provides
redundancy if one of the features or resource groups need maintenance or has a failure.
The IFP and resource groups support the following infrastructure management functions:
Firmware update of adapters and resource groups
Error recovery and failure data collection
Diagnostic and maintenance tasks
For more information about the IFP and resource groups, see Appendix G, "Native Peripheral
Component Interconnect Express" on page 521.

4.12 Flash Express

The Flash Express cards are supported in a PCIe I/O drawer with other PCIe I/O cards and
can be ordered as new (FC 403) or carry-forward (FC 402). They are plugged into PCIe I/O
drawers in pairs for availability. Like the Crypto Express5S cards, each card has a PCHID,
and no HCD/IOCP definition is required. Flash Express subchannels are predefined, and are
allocated from the 256 subchannels that are reserved in subchannel set 0.
Flash Express cards are internal to the CPC, and are accessible by using the new z Systems
extended asynchronous data mover (EADM) facility. EADM is an extension of the
asynchronous data mover (ADM) architecture that was used in the past with expanded
storage. EADM access is initiated with a Start Subchannel instruction.
z13s servers support a maximum of four pairs of Flash Express cards. Only one Flash
Express card is allowed per I/O domain. Each PCIe I/O drawer has four I/O domains, and can
install two pairs of Flash Express cards. Each pair is installed either in the front of PCIe I/O
drawers at slots 1 and 14, or in the rear at slots 25 and 33. The Flash Express cards are first
plugged into the front of the PCIe I/O drawer before being plugged into the rear of drawer.
These four slots (1, 14, 25, and 33) are reserved for Flash Express and must not be filled by
other types of I/O cards until there is no spare slot.
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IBM z13s Technical Guide