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doc: Document Berlin's hard-reset procedure. 

* doc/infra-handbook.org (Last resort: performing a hard reset of Berlin):
New section.
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Tobias Geerinckx-Rice 2023-11-26 01:00:00 +01:00
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@ -135,6 +135,14 @@ After having connected to the iDRAC interface, the serial console can
be entered by typing the ~console com2~ command at the ~racadm>> ~
prompt. To exit, press ~C-\~.
** Last resort: performing a hard reset of Berlin
If not even the serial console responds, it's time to use the same
~racadm>> ~ prompt to summon an invisible hand to press the reset
button for you, by typing ~serveraction hardreset~.
Do this only if there is no other way to gracefully reboot the system.
** Repairing a non-bootable Guix System via a PXE booted image
One way to fix a non-bootable Guix System is to boot a different