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Hardware notes

Seamicro Chassis​

Seamicro was a brand that vanished from market but that's the hardware we still use for CentOS CI infra. It's composed of :

  • hardware chassis working in "fabric" mode
  • network switch[es]
  • management (inband and out-of-band)
  • storage pool (64 * SSD)
  • compute card (64) each with dedicated cpu/memory and link to network/storage pool

Worth knowing that Seamicro doesn't provide webui for management, nor is ipmi compliant. There is also no vga/keyboard/mouse interaction with the chassis nor the compute nodes (servers).

There are only two ways to interact with chassis :

  • rest api exposed on the management ip of the chassis
  • cli (ssh into management card)

We'll cover here some basic operations to power-on/off a server, take a remote SoL console (each compute node emulates ttyS0 so all installs are using serial redirection, as no vga, for console access).

Just keep in mind that indexing starts at 0 so first compute node is 0/0 and second one 1/0 and so on.

The CLI looks like cisco IOS so if you're familiar with it, it would all make sense.

!!! note we keep all chassis configuration in a git repository (that can be reused to reconfigure a whole chassis easily, including network/disks/vlan/etc)

node operations​

`ssh into admin@`````<chassis>lt;chassis\<chassis>``gt;````

See summary/status​

show server summary ````&lt;n&gt;````/0/g

Power Off​

enable; power-off server ````&lt;n&gt;````/0/g [force]

Power on​

enable; power-on server ````&lt;n&gt;````/0/g [force]

reset a node​

enable; reset server ````&lt;n&gt;````/0/g

Forcing a boot over pxe​

enable ; reset server ````&lt;n&gt;````/0/g using-pxe

Chassis operation​

`ssh into admin@`````<chassis>lt;chassis\<chassis>``gt;````

Power off all nodes​

enable; power-off server all [force]

Power on all nodes​

enable; power-on server all [force]

Reset chassis​

enable; power-off server all [force]
reload

Access serial console of a seamicro node​

ssh into admin@```\``&lt;chassis&gt;``lt;chassis\``&lt;chassis&gt;``gt;```
enable; server console connect ````&lt;n&gt;````/0/g