# 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>`

#### See summary/status
`show server summary <n>/0/g`

#### Power Off
`enable; power-off server <n>/0/g [force]`

#### Power on
`enable; power-on server <n>/0/g [force]`

#### reset a node
`enable; reset server <n>/0/g`

### Forcing a boot over pxe
`enable ; reset server <n>/0/g using-pxe`


### Chassis operation
`ssh into admin@<chassis>`

#### 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@<chassis>
enable; server console connect <n>/0/g
```