IBM z13s, Technical Manual

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Chapter 7. Software support
249
7.3.6 z Enterprise Data Compression Express
The growth of data that must be captured, transferred, and stored for a long time is
unrelenting. Software-implemented compression algorithms are costly in terms of processor
resources, and storage costs are not negligible either.
zEDC is an optional feature that is available to z13, z13s, zEC12, and zBC12 servers that
addresses those requirements by providing hardware-based acceleration for data
compression and decompression. zEDC provides data compression with lower CPU
consumption than the compression technology that previously was available on z Systems.
Exploitation support of zEDC Express functions is provided by z/OS V2R1zEnterprise Data
Compression or higher for both data compression and decompression.
Support for data recovery (decompression) when the zEDC is not installed, or installed but
not available on the system, is provided through software on z/OS V2R2, z/OS V2R1, V1R13,
and V1R12 with the correct PTFs. Software decompression is slow and uses considerable
processor resources. It is therefore not suggested for production environments.
zEDC is enhanced to support QSAM/BSAM (non-VSAM) data set compression. This support
can be achieved by any of the following ways
򐂰 Data class level: Two new values, zEDC Required ( ZR ) and zEDC Preferred ( ZP ), can be
set with the COMPACTION option in the data class.
򐂰
System Level: Two new values, zEDC Required (
ZEDC_R
) and zEDC Preferred (
ZEDC_P
),
can be specified with the
COMPRESS
parameter found in the IGDSMSXX member of the
SYS1.PARMLIB data sets.
Data class takes precedence over system level.
Table 7-8 shows the minimum support requirements for zEDC Express.
Table 7-8 Minimum support requirements for zEDC Express
For more information about zEDC Express, see Appendix J, “IBM zEnterprise Data
Compression Express” on page 551.
7.3.7 10GbE RoCE Express
The IBM z13s supports the RoCE Express feature. It extends this support by providing
support to the second port on the adapter and by sharing the ports to up 31 partitions, per
adapter, using both ports.
The 10 Gigabit Ethernet (10GbE) RoCE Express feature is designed to help reduce
consumption of CPU resources for applications that use the TCP/IP stack (such as
WebSphere accessing a DB2 database). Use of the 10GbE RoCE Express feature also can
help reduce network latency with memory-to-memory transfers using Shared Memory
Operating system Support requirements
z/OS z/OS V2R1
a
z/OS V1R13
a
(Software decompression support only)
z/OS V1R12
a
(Software decompression support only)
a. PTFs are required.
z/VM z/VM 6.3
b
b. For guest use. PTF support required.