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Making a Linux home server sleep on idle and wake on demand (2023)
Daniel P. Gross is a computer software and hardware professional based in Toronto.
It began with what seemed like a final mundane touch to my home server setup for hosting Time Machine backups: I wanted it to automatically sleep when idle and wake up again when needed. A closer look at the same superuser discussion above revealed exactly the reason for the second problem: shortly after going to sleep, the machine was effectively disappearing from the network because it was no longer responding to ARP requests. A port-mirrored Wireshark capture answered that question: the Mac wasn’t sending any packets to the server, even long after it started to say Connecting to backup disk.... Digging into the macOS Time Machine logs with:
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