# 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
```