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I've got a Raspberry Pi 1 Model B that has been my trusty workhorse for a few years. It normally chugs away happily running transmission, pi-hole and a node.js app simultaneously.

All of a sudden it's started to become unresponsive under load. I can no longer SSH into it, but I can still ping it during this time. I can't access the transmission or pi-hole web clients when this happens either.

The only thing I can think of is that I've moved abroad and I'm now on a 120v circuit, but the power unit does say it's capable of running on 120-240v. It's a 5V 2A unit which has never caused me any problems in the UK.

What are some steps I could take to try and diagnose the problem?

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    If you've crossed the seas, you're likely on a different network. What else is on this network? What kind of router do you have? Has anything else on your network gotten infected? – YetAnotherRandomUser Nov 17 '18 at 18:30
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    Have you tried swapping out the power supply and/or USB cable? – YetAnotherRandomUser Nov 17 '18 at 18:30
  • I've swapped the USB cable and it seems a little more stable, it might have deteriorated. I have a better router than before, nothing else on the network is struggling. Getting a lot of 'unable to save resume file: input / output error' with transmission...the HDD it's hooked up to was also at about 95% capacity so hopefully that will stop now. Possibly multiple issues manifesting at once.. – Steji Nov 17 '18 at 20:17
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Turns out the SD card was done for. This became apparent when trying to format it and it couldn't be done.

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One option is to use a monitoring tool, i.e. Munin:

Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems.

source: http://munin-monitoring.org/

You can find an introductory guide and more options here.

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