Chapter 4. Central processor complex I/O system structure 185
Figure 4-11 shows a PCIe I/O drawer that is fully populated with Flash Express cards.
Figure 4-11 PCIe I/O drawer that is fully populated with Flash Express cards
4.12.1 IBM Flash Express read/write cache
On IBM z13s and z13 servers, Driver 27 Flash Express can provide a read/write cache that
greatly increases performance by allowing customer data to be stored temporarily in a cache
in the system's hardware system area (HSA) RAM. For this purpose, 0.5 GB of HSA space is
reserved on z13s servers and 4 GB on z13 Driver 27 servers.
Extended asynchronous data mover (EADM) operations would complete from a partition's
perspective immediately after data is moved to/from HSA cache, long before IBM Flash
Express operations have completed.
4.13 10GbE RoCE Express
RoCE Express (FC 0411) is exclusively in the PCIe I/O drawer and is supported on z13s, z13,
zEC12, and zBC12 servers. The 10GbE RoCE Express feature has one PCIe adapter. It does
not use a CHPID. It is defined by using the input/output configuration program (IOCP)
FUNCTION statement or in the HCD. For zEC12 and zBC12, each feature can only be
dedicated to an LPAR, and z/OS can support only one of the two ports. In z13s servers, both
two ports are supported by z/OS and can be shared by up to 31 partitions (LPARs).The
10GbE RoCE Express feature uses an SR laser as the optical transceiver, and supports the
use of a multimode fiber optic cable that terminates with an LC Duplex connector. Both
point-to-point connections and switched connections with an enterprise-class 10 GbE switch
are supported.
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