Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-ServerNet Lines
Expand Configuration and Management Manual—523347-008
12-11
Considerations
Considerations
•
Not all modifiers have associated values (for example, L4EXTPACKETS_ON).
•
The modifier_keyword and modifier_value parameters do not add the
specified modifier, or a modifier and its associated value, to the profile used by the
device. Use the ADD PROFILE command to add a modifier, or a modifier and its
associated value, to a profile.
•
Here are recommended configuration guidelines for configuring Expand-over-
ServerNet line handlers. (If you use the Guided Procedure for Configuring a
ServerNet Node, processors 0 and 1 will automatically be avoided.)
a. Configure primary and backup Expand-over-ServerNet line handlers in
processors in different enclosures (except for two-processor systems, which
have only one enclosure).
b. Avoid configuring an Expand-over-ServerNet line handler on processors 0
and 1, if possible. Some other processes can only run in processors 0 and 1,
increasing the impacts of CPU halts. Note that (b) can only be applied in
systems with at least three enclosures. On a four-processor system, the
process pair is to be configured according to (a), meaning that one of the sides
of the pair will run in either processor 0 or 1.
c. Avoid configuring the Expand-over-ServerNet line handler on processors
outside the tetrahedron (processors greater than 9) whenever possible. There
are more ServerNet components (routers and links) along the paths from these
processors to the external fabrics than along paths that originate in processors
within the tetrahedron. Consequently, the probability that these paths may fail
in the presence of hardware faults is higher.
Example
In the following example, a device named #SC001 is created for an Expand-over-
ServerNet line-handler process.
-> ADD DEVICE $ZZWAN.#SC001, PROFILE PEXPSSN, &
IOPOBJECT $SYSTEM.SYSTEM.LHOBJ, CPU 2, ALTCPU 5, TYPE (63,4), &
RSIZE 0, PATHTF 1, ASSOCIATEDEV $ZZSCL, NEXTSYS 102, &
COMPRESS_OFF, PATHBLOCKBYTES 0, PATHPACKETBYTES 4095