HP XC System Software Release Notes for Version 2.1

Interconnect Notes

This chapter contains generic information that applies to the supported

interconnect types:

• InfiniBand

interconnect (Section 12.1)

• Myrinet

interconnect (Section 12.2)

• QsNet

interconnect (Section 12.3)

12.1 InfiniBand Interconnect

At the time of publication, there are no release notes specific to the InfiniBand

interconnect.

12.2 Myrinet Interconnect

The following release notes are specific to the Myrinet interconnect.

12.2.1 The clear_counters Command Does Not Work on the 256 Port

Switch

The /opt/gm/sbin/clear_counters command does not clear the counters on

the Myrinet 256 port switch. The web interface to the Myrinet 256 port switch has

changed from the earlier, smaller switches.

To clear the switch counters, you must open an interactive Web connection to the

switch and clear the counters using the menu commands. The gm_prodmode_mon

script, which uses the clear_counters command, will not clear the counters

periodically, as it does on the smaller switches.

This problem will be resolved in a future software update from Myricom.

12.2.2 New or Changed Myrinet GM Routes May Not Be Found by

gm_board_info

It is possible for a problem to occur on the Myrinet GM network that causes some

nodes to be unable to update their GM map files. This is most noticeable when a

node reboots and sees no other nodes on the GM network even though one or more

nodes are connected and working on the network.

If this problem occurs, run the following command on all nodes (including SFS

servers and clients) connected to the GM network:

# /opt/gm/bin/gm_board_info | grep -e "Mapper is" -e "Map version is"

Command output will look like this if a node is affected by this problem:

Mapper is 00:00:00:00:00:00.

Map version is 4120027.

The Map version is a numeric identifier of the current network topology that the

node sees on the GM network. If a node is exhibiting the problem, the map version

will be different from the other systems because its map of the network will not

Interconnect Notes 12-1