Systems Css: Channel Subsystems With Channel Spanning - IBM z13s Technical Manual

A sample of channel paths that are defined as dedicated, shared, and spanned is shown in
Figure 5-3.
Partition
CHPID
PCHID
Figure 5-3 z Systems CSS: Channel subsystems with channel spanning
In the sample, three different definitions of a channel path are shown:
CHPID FF, assigned to PCHID 20A, is dedicated access for partition 15 of LCSS0, same
apply to CHPID 00,01,02 of LCSS0, and CHPID 00,01, FF of LCSS1.
CHPID 03, assigned to PCHID 20E is shared access for partition 2, and 15 of LCSS0,
same apply to CHPID 05 of LCSS1.
CHPID 06, assigned to PCHID 120 is spanned access for partition 1, 15 of LCSS0, and
partition 16, 17 of LCSS1, same apply to CHPID 04.
Channel spanning is supported for internal links (HiperSockets and IC links) and for certain
types of external links. External links that are supported on z13s servers include FICON
Express16S, FICON Express8S, FICON Express8 channels, OSA-Express5S,
OSA-Express4S, and Coupling Links.
The definition of LPAR name, MIF image ID, and LPAR ID are used by the channel subsystem
to identify an LPAR to identify I/O functions from different LPARs of multiple LCSSs. Doing so
supports the implementation of these dedicated, shared, and spanned accessing.
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IBM z13s Technical Guide
. . .
Partition
Partition
14
2
1
CSS0
. . .
MIF-1 MIF-2 MIF-F
CHPID
CHPID CHPID CHPID
03
01 02
00
. . .
Share
PCHID PCHID PCHID
PCHID
10C 10D
10B
20E
Partition Partition Partition
Partition
15
16 17
MIF-1 MIF-2 MIF-3
CHPID
CHPID
FF
06
. . .
04
SPAN
SPAN
20A
PCHID
120
. . .
Partition
18
40
CSS1
. . .
MIF-F
CHPID
CHPID
CHPID CHPID CHPID
05
00
01 22 FF
Share
PCHID
PCHID PCHID PCHID PCHID
145
146 147 158 159
. . .