Appendix J. IBM zEnterprise Data Compression Express 553
Figure J-1 illustrates the PCIe I/O drawer structure and the relationships among card slots,
domains, and resource groups.
Figure J-1 Relationships between the PCIe I/O drawer card slots, I/O domains, and resource groups
J.3 Software support
Support of the zEDC Express function is provided by z/OS V2R1 zEnterprise Data
Compression or later for both data compression and decompression. Support for data
recovery (decompression) in the case that zEDC is not installed, or installed but not available,
is provided through software in z/OS V2R2, V2R1, V1R13, and V1R12 with the appropriate
program temporary fixes (PTFs). Software decompression is slow and can use considerable
processor resources. Therefore, it is not suggested for production environments.
See the appropriate fixcat for SMP/E to install prerequisite PTFs. The fixcat function is
explained here:
http://www.ibm.com/systems/z/os/zos/features/smpe/fix-category.html
The fix category named IBM.Function.zEDC that identifies the fixes that enable or use the
zEDC function.
For more Information about Implementation and usage of the zEDC feature, see Reduce
Storage Occupancy and Increase Operations Efficiency with IBM zEnterprise Data
Compression, SG24-8259.
Domain 0 Domain 2
1, 2, 3, 4 6, 7, 8, 9 11,12,13,14 16,17,18,19
Front
• Feature card slots:
RG1: 1-4, 6-9, 30-33, 35-38
• RG2: 11-14, 16-19, 20-23, 25-28
All features are balanced to provide
redundancy.
• The drawer used and slot used determine
the Resource Group and the PCHIDs.
• zEDC and RoCE pairs are plugged left
(domain) and then right (domain).
This keeps them in different domains and
different Resource Groups.
• For each LPAR, ensure that multiple cards
are divided between Resource Groups.
7U
7U
Rear
Domain 3 Domain 1
20,21,22,23 25,26,27,28 30,31,32,33 35,36,37,38
AMD
DCA
Resource Group 1
Resource Group 2
PCIe Switch Card
Reference: z/OS support for the zEDC can be found by using FIXCAT:
IBM.Function.zEDC.
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