David: Created page with "= No 100GbE link = During the bringup of our initial IPU M2000 units, it was noticed that the 100GbE interfaces would not give a link. More correctly, they did provide a link..."

2021-02-02T22:27:13Z

Created page with "= No 100GbE link = During the bringup of our initial IPU M2000 units, it was noticed that the 100GbE interfaces would not give a link. More correctly, they did provide a link..."

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= No 100GbE link =
During the bringup of our initial IPU M2000 units, it was noticed that the 100GbE interfaces would not give a link. More correctly, they did provide a link as the unit was powered on but as the fans ramped down after a minute or so, the link would drop.<br/><br/>
The management interface would show a link, as expected.<br/><br/>
It was identified that there was an issue with the software on the early IPU M2000 which mean the GW and IPUs were not being powered on automatically.

== Accessing the IPU M2000 BMC ==

=== Identify the BMC's IP address ===
To access the IPU M2000's BMC, first it is necessary to identify the unit IP address. This can be achieved by a number of methods but it is usually simple enough to look through the <code>/var/log/syslog</code> syslog to find the IP address offered by the DHCP server:
<pre>
ipuuser@ipu-host-2:~$ sudo grep dhcpd /var/log/syslog* | grep -i discover
/var/log/syslog.1:Jan 20 14:23:29 ipu-host-2 dhcpd[3474]: DHCPDISCOVER from 70:69:79:20:13:b4 via enp65s0f1

ipuuser@ipu-host-2:~$ sudo grep 70:69:79:20:13:b4 /var/log/syslog*
/var/log/syslog:Jan 21 06:27:08 ipu-host-2 dhcpd[3474]: DHCPREQUEST for 10.1.1.1 from 70:69:79:20:13:b4 via enp65s0f1
/var/log/syslog:Jan 21 06:27:08 ipu-host-2 dhcpd[3474]: DHCPACK on 10.1.1.1 to 70:69:79:20:13:b4 via enp65s0f1
</pre>

=== Access the IPU's BMC using SSH ===
SSH to the IP address identified above using the login credentials of '''root''' and '''0penBmc''':
<pre>
ipuuser@ipu-host-2:~$ ssh 10.1.1.1 -l root
The authenticity of host '10.1.1.1 (10.1.1.1)' can't be established.
RSA key fingerprint is SHA256:SW5Bwfpj/WjkwYu8eQoVefyquJhLmUM3AxCrzW0eYfA.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.1.1.1' (RSA) to the list of known hosts.
root@10.1.1.1's password:
=======================================================================
Graphcore IPU-Machine ipum-p2-rev1 - OpenBMC gc-v1.6.0-21-g2ad233f

Some useful commands:
ipum-utils Collection of Power and Boot Control Commands.
ipum-diags Enter Maintenance Mode. For low level testing including BIST.
ipum_sysfpga Utility for Upgrading System FPGA.
obmc-console-client Serial Console Access to Gateway SOC. To exit press "Enter" and then "~.".

This login is using the default root password. It is advised to change it, using Redfish or GUI.
=======================================================================
root@ipum-p2-rev1-8204721-0012:~#
</pre>

=== Power on GW and IPUs ===
Run the following command:
<pre>
root@ipum-p2-rev1-8204721-0012:~# ipum-utils power_on
</pre>

Graphcore M2000 System Debug - Revision history

David: Created page with "= No 100GbE link = During the bringup of our initial IPU M2000 units, it was noticed that the 100GbE interfaces would not give a link. More correctly, they did provide a link..."