IBM Z9 Planning Manual page 83

Use the CHPID PART|PARTITION, NOTPART, and SHARED keywords to
determine which:
v Channel paths are assigned to each LP
v Devices and control units are shared among LPs
v Channel paths are reconfigurable
v Channel paths are shared
Use the CHPID CPATH keyword to connect two internal coupling channels.
Use the CHPID PATH keyword to define a channel path as spanned to multiple
CSSs. Spanned channel paths are also shared channel paths.
DCM channel paths are implicitly shared. Use of the IOCLUSTER keyword implies
a null access list (no logical partition has the channel path brought online at
activation) and a candidate list of all defined logical partitions. The IOCLUSTER
keyword is mutually exclusive with the PART|PARTITION and NOTPART keywords.
All LP names that you specify in the CHPID statements must match those specified
in the RESOURCE statement. An IOCDS must have at least one LP name defined.
PARTITION={(CSS(cssid),{name|0}[,REC])|
(CSS(cssid),access list)|
(CSS(cssid),(access list)[,(candidate list)][,REC])|
((CSS(cssid),(access list)[,(candidate list)]),...)}
NOTPART={(CSS(cssid),access list)|
((CSS(cssid),(access list)[,(candidate list)]),...)}
IOCLUSTER=cluster_name
SHARED
CPATH=(CSS(cssid),chpid number)
Where:
name specifies the name of the LP that has authority to access the
CHPID. The LP name is a 1–8 alphanumeric (0–9, A–Z) character
name that must have an alphabetic first character. Special
characters ($, #, @) are not allowed. A reserved LP cannot have
any channel paths assigned to it.
The following words are reserved and you cannot use them as LP
names:
PHYSICAL
REC
SYSTEM
PRIMnnnn (where nnnn are digits)
ICP IOCP supports a maximum of 60 LP names for the CPC.
cluster_name specifies the name of an LPAR cluster that has authority to access
the specified DCM CHPID. The name of the LPAR cluster is a one-
to eight- alphanumeric character name (0-9, A-Z) that must have an
alphabetic first character. Special characters ($, #, @) are not
allowed.
REC specifies that the CHPID is reconfigurable. A reconfigurable CHPID
must have an initial access list of one LP name. It's candidate list
must consist of one or more LP names.
Chapter 2. Planning Considerations
2-29