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# Hardware notes
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## Seamicro Chassis
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Seamicro was a brand that vanished from market but that's the hardware we still use for CentOS CI infra.
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It's composed of :
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* hardware chassis working in "fabric" mode
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* network switch[es]
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* management (inband and out-of-band)
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* storage pool (64 * SSD)
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* compute card (64) each with dedicated cpu/memory and link to network/storage pool
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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).
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There are only two ways to interact with chassis :
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* rest api exposed on the management ip of the chassis
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* cli (ssh into management card)
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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).
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Just keep in mind that indexing starts at 0 so first compute node is 0/0 and second one 1/0 and so on.
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The CLI looks like cisco IOS so if you're familiar with it, it would all make sense.
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!!! note
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we keep all chassis configuration in a git repository (that can be reused to reconfigure a whole chassis easily, including network/disks/vlan/etc)
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### node operations
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`ssh into admin@<chassis>`
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#### See summary/status
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`show server summary <n>/0/g`
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#### Power Off
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`enable; power-off server <n>/0/g [force]`
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#### Power on
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`enable; power-on server <n>/0/g [force]`
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#### reset a node
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`enable; reset server <n>/0/g`
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### Forcing a boot over pxe
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`enable ; reset server <n>/0/g using-pxe`
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### Chassis operation
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`ssh into admin@<chassis>`
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#### Power off all nodes
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`enable; power-off server all [force]`
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#### Power on all nodes
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`enable; power-on server all [force]`
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#### Reset chassis
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```
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enable; power-off server all [force]
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reload
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```
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### Access serial console of a seamicro node
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```
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ssh into admin@<chassis>
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enable; server console connect <n>/0/g
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```
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