IBM 990 - Manual (Page 127)

Chapter 4. Channel Subsystem 115
Channel spanning is supported for internal links (HiperSockets, and Internal Coupling (IC)
links), and for some external links (FICON Express channels, OSA-Express, and coupling
links). For a complete list of supported spanned channels, see Table 3-8 on page 92.
In Figure 4-4, CHPID 04 is spanned to LCSS0 and LCSS1. Since it is not an external channel
link, there is no PCHID assigned. CHPID 06 is an external spanned channel and has a
PCHID assigned.
Figure 4-4 z990 CSS - two Logical Channel Subsystems with channel spanning
4.2 LCSS configuration management
Tools are provided to maintain and optimize the I/O configuration of a z990.
IBM Configurator for e-business (e-Config)
The e-Config tool is available to your IBM representative. It is used to configure new
configurations or upgrades of existing configuration, and maintains installed features of those
configurations.
Hardware Configuration Dialog (HCD)
HCD supplies an interactive dialog to generate your I/O definition file (IODF) and
subsequently your Input/Output Configuration Data Set (IOCDS). It is strongly recommended
that HCDor HCM be used to generate your I/O configuration, as opposed to writing your own
IOCP. The validation checking that HCD performs as you enter data helps eliminate errors
before you implement your I/O configuration.
Note: Spanning of ESCON channels, FICON converter (FCV) channels, and receiver
coupling links are not supported.
LCSS0 LCSS1
Partition
1
Partition
2
Partition
15
Partition
14
Partition
16
Partition
17
Partition
18
Partition
30
MIF-1 MIF-2 MIF-F MIF-1 MIF-2 MIF-3 MIF-F
CHPID
00
CHPID
02
CHPID
01
CHPID
FF
PCHID
10B
PCHID
10D
PCHID
10C
PCHID
20A
CHPID
04
SPAN PCHID
20E
PCHID
145
PCHID
147
PCHID
146
PCHID
158
PCHID
159
CHPID
03
Share
CHPID
06
SPAN
PCHID
120
CHPID
00
CHPID
01
CHPID
22
CHPID
FF
CHPID
05
Share